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Neural crest cells Stock Photos and Images
Dorsal root ganglion. Pseudounipolar neurons of a dorsal root ganglion. Hematoxlyn and eosin stain. Magnification: x40. Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/dorsal-root-ganglion-pseudounipolar-neurons-of-a-dorsal-root-ganglion-hematoxlyn-and-eosin-stain-magnification-x40-image471432248.htmlRF2JAYGJ0–Dorsal root ganglion. Pseudounipolar neurons of a dorsal root ganglion. Hematoxlyn and eosin stain. Magnification: x40.
The Neural crest formation during neurulation.Vector illustration. Stock Vectorhttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-neural-crest-formation-during-neurulationvector-illustration-image574672041.htmlRF2TAXG1D–The Neural crest formation during neurulation.Vector illustration.
. The development of the chick; an introduction to embryology . origin, and appear to have a more intimate connection withthe myotome. In the more anterior and older somites, twentyand seventeen (Figs. 109 and 110), the process has progressedmuch farther and the neural crest cells are completely expelledfrom the neural tube, which closes after them (Fig. 110). A j-etlater stage is shown in Fig. Ill, through the twenty-third somiteof a 35 s embryo. The dorsal commissure uniting the right and left sides of thecrest ruptures, and the cells of the crest aggregate so as to forma pair of ganglia in Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-chick-an-introduction-to-embryology-origin-and-appear-to-have-a-more-intimate-connection-withthe-myotome-in-the-more-anterior-and-older-somites-twentyand-seventeen-figs-109-and-110-the-process-has-progressedmuch-farther-and-the-neural-crest-cells-are-completely-expelledfrom-the-neural-tube-which-closes-after-them-fig-110-a-j-etlater-stage-is-shown-in-fig-ill-through-the-twenty-third-somiteof-a-35-s-embryo-the-dorsal-commissure-uniting-the-right-and-left-sides-of-thecrest-ruptures-and-the-cells-of-the-crest-aggregate-so-as-to-forma-pair-of-ganglia-in-image374665423.htmlRM2CNFDFY–. The development of the chick; an introduction to embryology . origin, and appear to have a more intimate connection withthe myotome. In the more anterior and older somites, twentyand seventeen (Figs. 109 and 110), the process has progressedmuch farther and the neural crest cells are completely expelledfrom the neural tube, which closes after them (Fig. 110). A j-etlater stage is shown in Fig. Ill, through the twenty-third somiteof a 35 s embryo. The dorsal commissure uniting the right and left sides of thecrest ruptures, and the cells of the crest aggregate so as to forma pair of ganglia in
A cross section of the embryonic disk, showing formation of the neural tube. Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/stock-photo-a-cross-section-of-the-embryonic-disk-showing-formation-of-the-neural-24898350.htmlRMBCE62P–A cross section of the embryonic disk, showing formation of the neural tube.
. The development of the chick; an introduction to embryology. Birds -- Embryology. FROM TWELVE TO THIRTY-SIX SOMITES 157 appear to form mesenchyme. The formation of mesenchyme from certain parts of the neural crest is most marked in the region of the brain. The primordia of the gangha contain the cells (neuroblasts) which form the dorsal root fibers of the spinal nerves and parts of certain cranial nerves. They also appear to contain the cells from which the sheaths of the nerve fibers are formed; thus three kinds of cells at least are found in the neural crest, viz., mesenchyme forming cells Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-chick-an-introduction-to-embryology-birds-embryology-from-twelve-to-thirty-six-somites-157-appear-to-form-mesenchyme-the-formation-of-mesenchyme-from-certain-parts-of-the-neural-crest-is-most-marked-in-the-region-of-the-brain-the-primordia-of-the-gangha-contain-the-cells-neuroblasts-which-form-the-dorsal-root-fibers-of-the-spinal-nerves-and-parts-of-certain-cranial-nerves-they-also-appear-to-contain-the-cells-from-which-the-sheaths-of-the-nerve-fibers-are-formed-thus-three-kinds-of-cells-at-least-are-found-in-the-neural-crest-viz-mesenchyme-forming-cells-image215970287.htmlRMPFA88F–. The development of the chick; an introduction to embryology. Birds -- Embryology. FROM TWELVE TO THIRTY-SIX SOMITES 157 appear to form mesenchyme. The formation of mesenchyme from certain parts of the neural crest is most marked in the region of the brain. The primordia of the gangha contain the cells (neuroblasts) which form the dorsal root fibers of the spinal nerves and parts of certain cranial nerves. They also appear to contain the cells from which the sheaths of the nerve fibers are formed; thus three kinds of cells at least are found in the neural crest, viz., mesenchyme forming cells
Archive image from page 176 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 FROM TWELVE TO THIRTY-SIX SOMITES 157 appear to form mesenchyme. The formation of mesenchyme from certain parts of the neural crest is most marked in the region of the brain. The primordia of the gangha contain the cells (neuroblasts) which form the dorsal root fibers of the spinal nerves and parts of certain cranial nerves. They also appear to contain the cells from which the sheaths of the nerve fibers are formed; thus three kinds of c Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/archive-image-from-page-176-of-the-development-of-the-chick-the-development-of-the-chick-an-introduction-to-embryology-developmentofchi00lill-year-1908-from-twelve-to-thirty-six-somites-157-appear-to-form-mesenchyme-the-formation-of-mesenchyme-from-certain-parts-of-the-neural-crest-is-most-marked-in-the-region-of-the-brain-the-primordia-of-the-gangha-contain-the-cells-neuroblasts-which-form-the-dorsal-root-fibers-of-the-spinal-nerves-and-parts-of-certain-cranial-nerves-they-also-appear-to-contain-the-cells-from-which-the-sheaths-of-the-nerve-fibers-are-formed-thus-three-kinds-of-c-image258898384.htmlRMW15RET–Archive image from page 176 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 FROM TWELVE TO THIRTY-SIX SOMITES 157 appear to form mesenchyme. The formation of mesenchyme from certain parts of the neural crest is most marked in the region of the brain. The primordia of the gangha contain the cells (neuroblasts) which form the dorsal root fibers of the spinal nerves and parts of certain cranial nerves. They also appear to contain the cells from which the sheaths of the nerve fibers are formed; thus three kinds of c
Pseudounipolar neurons. Pseudounipolar neurons of rounded soma of a dorsal root ganglion.Сell body is surrounded by glia cells called satellite cells. Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/pseudounipolar-neurons-pseudounipolar-neurons-of-rounded-soma-of-a-dorsal-root-ganglionell-body-is-surrounded-by-glia-cells-called-satellite-cells-image471432281.htmlRF2JAYGK5–Pseudounipolar neurons. Pseudounipolar neurons of rounded soma of a dorsal root ganglion.Сell body is surrounded by glia cells called satellite cells.
The Neural crest formation during neurulation.Vector illustration. Stock Vectorhttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-neural-crest-formation-during-neurulationvector-illustration-image574672056.htmlRF2TAXG20–The Neural crest formation during neurulation.Vector illustration.
![. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. neal: nervous system in squalus acanthias. 221 early stages of its development, and their conclusions are therefore purely theoretical. Both agree in considering the nerve a derivative of neural-crest cells. Eabl ('89, p. 221) thinks he has some right to bi'ing this portion of the neural crest into genetic connection with these nerves, since the course of the third and fourth nerves in later stages corre- sponds with a portion of the trigeminus Anlage, which I infer from his description to be the " troch Stock Photo](https://c8.alamy.com/comp/RGFWGB/bulletin-of-the-museum-of-comparative-zoology-at-harvard-college-zoology-zoology-neal-nervous-system-in-squalus-acanthias-221-early-stages-of-its-development-and-their-conclusions-are-therefore-purely-theoretical-both-agree-in-considering-the-nerve-a-derivative-of-neural-crest-cells-eabl-89-p-221-thinks-he-has-some-right-to-biing-this-portion-of-the-neural-crest-into-genetic-connection-with-these-nerves-since-the-course-of-the-third-and-fourth-nerves-in-later-stages-corre-sponds-with-a-portion-of-the-trigeminus-anlage-which-i-infer-from-his-description-to-be-the-quot-troch-RGFWGB.jpg ". Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. neal: nervous system in squalus acanthias. 221 early stages of its development, and their conclusions are therefore purely theoretical. Both agree in considering the nerve a derivative of neural-crest cells. Eabl ('89, p. 221) thinks he has some right to bi'ing this portion of the neural crest into genetic connection with these nerves, since the course of the third and fourth nerves in later stages corre- sponds with a portion of the trigeminus Anlage, which I infer from his description to be the " troch Stock Photo")
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. neal: nervous system in squalus acanthias. 221 early stages of its development, and their conclusions are therefore purely theoretical. Both agree in considering the nerve a derivative of neural-crest cells. Eabl ('89, p. 221) thinks he has some right to bi'ing this portion of the neural crest into genetic connection with these nerves, since the course of the third and fourth nerves in later stages corre- sponds with a portion of the trigeminus Anlage, which I infer from his description to be the " troch Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/bulletin-of-the-museum-of-comparative-zoology-at-harvard-college-zoology-zoology-neal-nervous-system-in-squalus-acanthias-221-early-stages-of-its-development-and-their-conclusions-are-therefore-purely-theoretical-both-agree-in-considering-the-nerve-a-derivative-of-neural-crest-cells-eabl-89-p-221-thinks-he-has-some-right-to-biing-this-portion-of-the-neural-crest-into-genetic-connection-with-these-nerves-since-the-course-of-the-third-and-fourth-nerves-in-later-stages-corre-sponds-with-a-portion-of-the-trigeminus-anlage-which-i-infer-from-his-description-to-be-the-quot-troch-image233918619.htmlRMRGFWGB–. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. neal: nervous system in squalus acanthias. 221 early stages of its development, and their conclusions are therefore purely theoretical. Both agree in considering the nerve a derivative of neural-crest cells. Eabl ('89, p. 221) thinks he has some right to bi'ing this portion of the neural crest into genetic connection with these nerves, since the course of the third and fourth nerves in later stages corre- sponds with a portion of the trigeminus Anlage, which I infer from his description to be the " troch
. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. FROM TWELVE TO THIRTY-SIX SOMITES 157 appear to form mesenchyme. The formation of mesenchyme from certain parts of the neural crest is most marked in the region of the brain. The primordia of the gangha contain the cells (neuroblasts) which form the dorsal root fibers of the spinal nerves and parts of certain cranial nerves. They also appear to contain the cells from which the sheaths of the nerve fibers are formed; thus three kinds of cells at least are found in the neural crest, viz., mesenchyme Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-chick-an-introduction-to-embryology-embryology-chickens-embryos-from-twelve-to-thirty-six-somites-157-appear-to-form-mesenchyme-the-formation-of-mesenchyme-from-certain-parts-of-the-neural-crest-is-most-marked-in-the-region-of-the-brain-the-primordia-of-the-gangha-contain-the-cells-neuroblasts-which-form-the-dorsal-root-fibers-of-the-spinal-nerves-and-parts-of-certain-cranial-nerves-they-also-appear-to-contain-the-cells-from-which-the-sheaths-of-the-nerve-fibers-are-formed-thus-three-kinds-of-cells-at-least-are-found-in-the-neural-crest-viz-mesenchyme-image215970117.htmlRMPFA82D–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. FROM TWELVE TO THIRTY-SIX SOMITES 157 appear to form mesenchyme. The formation of mesenchyme from certain parts of the neural crest is most marked in the region of the brain. The primordia of the gangha contain the cells (neuroblasts) which form the dorsal root fibers of the spinal nerves and parts of certain cranial nerves. They also appear to contain the cells from which the sheaths of the nerve fibers are formed; thus three kinds of cells at least are found in the neural crest, viz., mesenchyme
Archive image from page 178 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 #5 ii't.f/''- Fig. 92. — Transverse section immediately be- hind the first visceral pouch of a chick embryo of thirteen somites. (After Gorono- witsch.) Note connection of the periaxial cord with the ectoderm of the visceral arch. Ad., Aorta descendens. c. Rounded me- senchyme cells, g. Place where cells derived from neural crest unite with the mesenchyme cells of the periaxial cord. f. Fusion, p. Spin- dle-shaped peripheral mesenchym Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/archive-image-from-page-178-of-the-development-of-the-chick-the-development-of-the-chick-an-introduction-to-embryology-developmentofchi00lill-year-1908-5-iitf-fig-92-transverse-section-immediately-be-hind-the-first-visceral-pouch-of-a-chick-embryo-of-thirteen-somites-after-gorono-witsch-note-connection-of-the-periaxial-cord-with-the-ectoderm-of-the-visceral-arch-ad-aorta-descendens-c-rounded-me-senchyme-cells-g-place-where-cells-derived-from-neural-crest-unite-with-the-mesenchyme-cells-of-the-periaxial-cord-f-fusion-p-spin-dle-shaped-peripheral-mesenchym-image258898880.htmlRMW15T4G–Archive image from page 178 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 #5 ii't.f/''- Fig. 92. — Transverse section immediately be- hind the first visceral pouch of a chick embryo of thirteen somites. (After Gorono- witsch.) Note connection of the periaxial cord with the ectoderm of the visceral arch. Ad., Aorta descendens. c. Rounded me- senchyme cells, g. Place where cells derived from neural crest unite with the mesenchyme cells of the periaxial cord. f. Fusion, p. Spin- dle-shaped peripheral mesenchym
. Comparative anatomy. Anatomy, Comparative. THE NERVOUS SYSTEM 559 and become concentrated into two parallel strands dorsal to the spinal cord. The crest is continuous throughout the entire length of the central nervous system, except for an interruption in the head region between the fifth and seventh nerves. As development proceeds, each strand of neural crest cells migrates en masse ventrad. In the trunk region the cells become more and more concentrated and metamerically arranged as a series of ganglionic masses median to the myotomes. For each myotome, there develops both a somatic motor Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/comparative-anatomy-anatomy-comparative-the-nervous-system-559-and-become-concentrated-into-two-parallel-strands-dorsal-to-the-spinal-cord-the-crest-is-continuous-throughout-the-entire-length-of-the-central-nervous-system-except-for-an-interruption-in-the-head-region-between-the-fifth-and-seventh-nerves-as-development-proceeds-each-strand-of-neural-crest-cells-migrates-en-masse-ventrad-in-the-trunk-region-the-cells-become-more-and-more-concentrated-and-metamerically-arranged-as-a-series-of-ganglionic-masses-median-to-the-myotomes-for-each-myotome-there-develops-both-a-somatic-motor-image232674972.htmlRMREF78C–. Comparative anatomy. Anatomy, Comparative. THE NERVOUS SYSTEM 559 and become concentrated into two parallel strands dorsal to the spinal cord. The crest is continuous throughout the entire length of the central nervous system, except for an interruption in the head region between the fifth and seventh nerves. As development proceeds, each strand of neural crest cells migrates en masse ventrad. In the trunk region the cells become more and more concentrated and metamerically arranged as a series of ganglionic masses median to the myotomes. For each myotome, there develops both a somatic motor
. Cunningham's Text-book of anatomy. Anatomy. Roof-plate Surface ectoderm Spinal ganglion (2) Sympathetic ganglion Chromaffin c^lls. Ependyma cells Posterior nerve Posterior nerve-root Anterior nerve-root Sympathetic ganglion Chromaffin cells Basal lamina with neuroblasts (3) Gut Anterior nerve-root Sympathetic ganglion - Chromaffin cells Roots of sympathetic ganglion Sympathetic nerve Secondary sympathetic ganglion Fig. 44.—-Diagrams illustrating the formation of (1) the rudiments of the primitive ganglion from the neural crest. (2) The differentiation of different parts of the primitive ga Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/cunninghams-text-book-of-anatomy-anatomy-roof-plate-surface-ectoderm-spinal-ganglion-2-sympathetic-ganglion-chromaffin-clls-ependyma-cells-posterior-nerve-posterior-nerve-root-anterior-nerve-root-sympathetic-ganglion-chromaffin-cells-basal-lamina-with-neuroblasts-3-gut-anterior-nerve-root-sympathetic-ganglion-chromaffin-cells-roots-of-sympathetic-ganglion-sympathetic-nerve-secondary-sympathetic-ganglion-fig-44-diagrams-illustrating-the-formation-of-1-the-rudiments-of-the-primitive-ganglion-from-the-neural-crest-2-the-differentiation-of-different-parts-of-the-primitive-ga-image216347124.htmlRMPFYCY0–. Cunningham's Text-book of anatomy. Anatomy. Roof-plate Surface ectoderm Spinal ganglion (2) Sympathetic ganglion Chromaffin c^lls. Ependyma cells Posterior nerve Posterior nerve-root Anterior nerve-root Sympathetic ganglion Chromaffin cells Basal lamina with neuroblasts (3) Gut Anterior nerve-root Sympathetic ganglion - Chromaffin cells Roots of sympathetic ganglion Sympathetic nerve Secondary sympathetic ganglion Fig. 44.—-Diagrams illustrating the formation of (1) the rudiments of the primitive ganglion from the neural crest. (2) The differentiation of different parts of the primitive ga
Archive image from page 122 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 cl o/r?J/es. O 6 .?>;: yT/. 6'ce/ Fig. 57. — Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. F., Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Mes., Splanchnic layer of mesoblast. anterior end rapidly grows forward b Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/archive-image-from-page-122-of-the-development-of-the-chick-the-development-of-the-chick-an-introduction-to-embryology-developmentofchi00lill-year-1908-cl-orjes-o-6-gt-yt-6ce-fig-57-later-stage-of-the-neural-folds-section-through-the-head-of-an-embryo-of-2-3-s-corresponding-to-about-the-future-mid-brain-region-coel-coelome-g-c-germinal-cells-med-pi-medullary-plate-mes-mesoblast-n-f-neural-fold-n-cr-neural-crest-nch-notochord-som-mes-somatic-layer-of-mesoblast-spl-mes-splanchnic-layer-of-mesoblast-anterior-end-rapidly-grows-forward-b-image258886189.htmlRMW157Y9–Archive image from page 122 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 cl o/r?J/es. O 6 .?>;: yT/. 6'ce/ Fig. 57. — Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. F., Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Mes., Splanchnic layer of mesoblast. anterior end rapidly grows forward b
. Comparative anatomy. Anatomy, Comparative. THE SENSE ORGANS 571 bottom of the groove become differentiated into clusters of neuromast cells surrounded by indifferent supporting cells. Mucus cells also develop, and fill the canal with their secretions. Nervous connexions are second- ary, and are formed by neurites from neural crest cells, usually of the vagus and facial ganglia, but sometimes of the glossopharyngeal ganglion. MUSCLE SPINDLES Muscle spindles form a special set of sensory nerve terminations upon muscle fibers, by means of which we are able to sense the degree of contraction of Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/comparative-anatomy-anatomy-comparative-the-sense-organs-571-bottom-of-the-groove-become-differentiated-into-clusters-of-neuromast-cells-surrounded-by-indifferent-supporting-cells-mucus-cells-also-develop-and-fill-the-canal-with-their-secretions-nervous-connexions-are-second-ary-and-are-formed-by-neurites-from-neural-crest-cells-usually-of-the-vagus-and-facial-ganglia-but-sometimes-of-the-glossopharyngeal-ganglion-muscle-spindles-muscle-spindles-form-a-special-set-of-sensory-nerve-terminations-upon-muscle-fibers-by-means-of-which-we-are-able-to-sense-the-degree-of-contraction-of-image232674870.htmlRMREF74P–. Comparative anatomy. Anatomy, Comparative. THE SENSE ORGANS 571 bottom of the groove become differentiated into clusters of neuromast cells surrounded by indifferent supporting cells. Mucus cells also develop, and fill the canal with their secretions. Nervous connexions are second- ary, and are formed by neurites from neural crest cells, usually of the vagus and facial ganglia, but sometimes of the glossopharyngeal ganglion. MUSCLE SPINDLES Muscle spindles form a special set of sensory nerve terminations upon muscle fibers, by means of which we are able to sense the degree of contraction of
![. The development of the chick; an introduction to embryology. Birds -- Embryology. #5 i^i^'t.f/*"*'-. Fig. 92. — Transverse section immediately be- hind the first visceral pouch of a chick embryo of thirteen somites. (After Gorono- witsch.) Note connection of the periaxial cord with the ectoderm of the visceral arch. Ad., Aorta descendens. c. Rounded me- senchyme cells, g. Place where cells derived from neural crest unite with the mesenchyme cells of the periaxial cord. f. Fusion, p. Spin- dle-shaped peripheral mesenchyme cells. the ectoderm in the neighborhood of the first visceral pouc Stock Photo](https://c8.alamy.com/comp/PFA885/the-development-of-the-chick-an-introduction-to-embryology-birds-embryology-5-iitfquot-fig-92-transverse-section-immediately-be-hind-the-first-visceral-pouch-of-a-chick-embryo-of-thirteen-somites-after-gorono-witsch-note-connection-of-the-periaxial-cord-with-the-ectoderm-of-the-visceral-arch-ad-aorta-descendens-c-rounded-me-senchyme-cells-g-place-where-cells-derived-from-neural-crest-unite-with-the-mesenchyme-cells-of-the-periaxial-cord-f-fusion-p-spin-dle-shaped-peripheral-mesenchyme-cells-the-ectoderm-in-the-neighborhood-of-the-first-visceral-pouc-PFA885.jpg ". The development of the chick; an introduction to embryology. Birds -- Embryology. #5 i^i^'t.f/*"*'-. Fig. 92. — Transverse section immediately be- hind the first visceral pouch of a chick embryo of thirteen somites. (After Gorono- witsch.) Note connection of the periaxial cord with the ectoderm of the visceral arch. Ad., Aorta descendens. c. Rounded me- senchyme cells, g. Place where cells derived from neural crest unite with the mesenchyme cells of the periaxial cord. f. Fusion, p. Spin- dle-shaped peripheral mesenchyme cells. the ectoderm in the neighborhood of the first visceral pouc Stock Photo")
. The development of the chick; an introduction to embryology. Birds -- Embryology. #5 i^i^'t.f/*"*'-. Fig. 92. — Transverse section immediately be- hind the first visceral pouch of a chick embryo of thirteen somites. (After Gorono- witsch.) Note connection of the periaxial cord with the ectoderm of the visceral arch. Ad., Aorta descendens. c. Rounded me- senchyme cells, g. Place where cells derived from neural crest unite with the mesenchyme cells of the periaxial cord. f. Fusion, p. Spin- dle-shaped peripheral mesenchyme cells. the ectoderm in the neighborhood of the first visceral pouc Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-chick-an-introduction-to-embryology-birds-embryology-5-iitfquot-fig-92-transverse-section-immediately-be-hind-the-first-visceral-pouch-of-a-chick-embryo-of-thirteen-somites-after-gorono-witsch-note-connection-of-the-periaxial-cord-with-the-ectoderm-of-the-visceral-arch-ad-aorta-descendens-c-rounded-me-senchyme-cells-g-place-where-cells-derived-from-neural-crest-unite-with-the-mesenchyme-cells-of-the-periaxial-cord-f-fusion-p-spin-dle-shaped-peripheral-mesenchyme-cells-the-ectoderm-in-the-neighborhood-of-the-first-visceral-pouc-image215970277.htmlRMPFA885–. The development of the chick; an introduction to embryology. Birds -- Embryology. #5 i^i^'t.f/*"*'-. Fig. 92. — Transverse section immediately be- hind the first visceral pouch of a chick embryo of thirteen somites. (After Gorono- witsch.) Note connection of the periaxial cord with the ectoderm of the visceral arch. Ad., Aorta descendens. c. Rounded me- senchyme cells, g. Place where cells derived from neural crest unite with the mesenchyme cells of the periaxial cord. f. Fusion, p. Spin- dle-shaped peripheral mesenchyme cells. the ectoderm in the neighborhood of the first visceral pouc
Archive image from page 122 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 .sc ;'' â ? yT/. ';': 6-:/ Fig. 57. â Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. P, Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Mes., Splanchnic layer of mesoblast. anterior end rapidly grows forward beyond the Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/archive-image-from-page-122-of-the-development-of-the-chick-the-development-of-the-chick-an-introduction-to-embryology-developmentofchi02lill-year-1936-sc-yt-6-fig-57-later-stage-of-the-neural-folds-section-through-the-head-of-an-embryo-of-2-3-s-corresponding-to-about-the-future-mid-brain-region-coel-coelome-g-c-germinal-cells-med-pi-medullary-plate-mes-mesoblast-n-p-neural-fold-n-cr-neural-crest-nch-notochord-som-mes-somatic-layer-of-mesoblast-spl-mes-splanchnic-layer-of-mesoblast-anterior-end-rapidly-grows-forward-beyond-the-image258886208.htmlRMW15800–Archive image from page 122 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 .sc ;'' â ? yT/. ';': 6-:/ Fig. 57. â Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. P, Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Mes., Splanchnic layer of mesoblast. anterior end rapidly grows forward beyond the
. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. 464 DEVELOPMENT OF PRIMITIVE BODY FORM NEURAL CREST CELLS. VAGUS LATERAL LINE PLACODES EPI BRANCHIAL PLACODES OF N VAGUS ^OTIC VESICLE -!V LATERAL LINE PLACODE LONGITUDINAL ECTODERMAL THICKENING ECTODERMAL THICKENING HYOMANOIBULAR CLEFT EPIBRANCHIAL PLACODE GLOSSOPHARYNGEUS FACIALIS D. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illu Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/comparative-embryology-of-the-vertebrates-with-2057-drawings-and-photos-grouped-as-380-illus-vertebrates-embryology-comparative-embryology-464-development-of-primitive-body-form-neural-crest-cells-vagus-lateral-line-placodes-epi-branchial-placodes-of-n-vagus-otic-vesicle-!v-lateral-line-placode-longitudinal-ectodermal-thickening-ectodermal-thickening-hyomanoibular-cleft-epibranchial-placode-glossopharyngeus-facialis-d-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitally-enhanced-for-readability-coloration-and-appearance-of-these-illu-image232675544.htmlRMREF80T–. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. 464 DEVELOPMENT OF PRIMITIVE BODY FORM NEURAL CREST CELLS. VAGUS LATERAL LINE PLACODES EPI BRANCHIAL PLACODES OF N VAGUS ^OTIC VESICLE -!V LATERAL LINE PLACODE LONGITUDINAL ECTODERMAL THICKENING ECTODERMAL THICKENING HYOMANOIBULAR CLEFT EPIBRANCHIAL PLACODE GLOSSOPHARYNGEUS FACIALIS D. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illu
![. Cunningham's Text-book of anatomy. Anatomy. âMesoderm of amnion â â âEctoderm of amnion - Neural crest Roof-plate Lateral wall of neural groove Floor-plate Mesoderm of^*" entoderm vesicle Entoderm' Cavity of entoderm vesicle Amnion cavity. Notochord Mesoderm of chorion Trophoblast of chorion Pig. 41. A. Transverse section of a zygote, showing the constituent parts. B. Diagram of embryonic area showing parts of neural plate and primitive streak. The apical portion of the hollow mesodermal somite is its scleratogenous segment. The cells of the scleratogenous section of the somite undergo Stock Photo](https://c8.alamy.com/comp/PFYCYR/cunninghams-text-book-of-anatomy-anatomy-mesoderm-of-amnion-ectoderm-of-amnion-neural-crest-roof-plate-lateral-wall-of-neural-groove-floor-plate-mesoderm-ofquot-entoderm-vesicle-entoderm-cavity-of-entoderm-vesicle-amnion-cavity-notochord-mesoderm-of-chorion-trophoblast-of-chorion-pig-41-a-transverse-section-of-a-zygote-showing-the-constituent-parts-b-diagram-of-embryonic-area-showing-parts-of-neural-plate-and-primitive-streak-the-apical-portion-of-the-hollow-mesodermal-somite-is-its-scleratogenous-segment-the-cells-of-the-scleratogenous-section-of-the-somite-undergo-PFYCYR.jpg ". Cunningham's Text-book of anatomy. Anatomy. âMesoderm of amnion â â âEctoderm of amnion - Neural crest Roof-plate Lateral wall of neural groove Floor-plate Mesoderm of^*" entoderm vesicle Entoderm' Cavity of entoderm vesicle Amnion cavity. Notochord Mesoderm of chorion Trophoblast of chorion Pig. 41. A. Transverse section of a zygote, showing the constituent parts. B. Diagram of embryonic area showing parts of neural plate and primitive streak. The apical portion of the hollow mesodermal somite is its scleratogenous segment. The cells of the scleratogenous section of the somite undergo Stock Photo")
. Cunningham's Text-book of anatomy. Anatomy. âMesoderm of amnion â â âEctoderm of amnion - Neural crest Roof-plate Lateral wall of neural groove Floor-plate Mesoderm of^*" entoderm vesicle Entoderm' Cavity of entoderm vesicle Amnion cavity. Notochord Mesoderm of chorion Trophoblast of chorion Pig. 41. A. Transverse section of a zygote, showing the constituent parts. B. Diagram of embryonic area showing parts of neural plate and primitive streak. The apical portion of the hollow mesodermal somite is its scleratogenous segment. The cells of the scleratogenous section of the somite undergo Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/cunninghams-text-book-of-anatomy-anatomy-mesoderm-of-amnion-ectoderm-of-amnion-neural-crest-roof-plate-lateral-wall-of-neural-groove-floor-plate-mesoderm-ofquot-entoderm-vesicle-entoderm-cavity-of-entoderm-vesicle-amnion-cavity-notochord-mesoderm-of-chorion-trophoblast-of-chorion-pig-41-a-transverse-section-of-a-zygote-showing-the-constituent-parts-b-diagram-of-embryonic-area-showing-parts-of-neural-plate-and-primitive-streak-the-apical-portion-of-the-hollow-mesodermal-somite-is-its-scleratogenous-segment-the-cells-of-the-scleratogenous-section-of-the-somite-undergo-image216347147.htmlRMPFYCYR–. Cunningham's Text-book of anatomy. Anatomy. âMesoderm of amnion â â âEctoderm of amnion - Neural crest Roof-plate Lateral wall of neural groove Floor-plate Mesoderm of^*" entoderm vesicle Entoderm' Cavity of entoderm vesicle Amnion cavity. Notochord Mesoderm of chorion Trophoblast of chorion Pig. 41. A. Transverse section of a zygote, showing the constituent parts. B. Diagram of embryonic area showing parts of neural plate and primitive streak. The apical portion of the hollow mesodermal somite is its scleratogenous segment. The cells of the scleratogenous section of the somite undergo
Archive image from page 122 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 HEAD-FOLD TO TWELVE SOMITES 103 /? Cr /?. /- /? Cr. 26 efi'»:£ee »i t Coe/. .sc ;'' â ? yT/. ';': 6-:/ Fig. 57. â Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. P, Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/archive-image-from-page-122-of-the-development-of-the-chick-the-development-of-the-chick-an-introduction-to-embryology-developmentofchi02lill-year-1936-head-fold-to-twelve-somites-103-cr-cr-26-efiee-i-t-coe-sc-yt-6-fig-57-later-stage-of-the-neural-folds-section-through-the-head-of-an-embryo-of-2-3-s-corresponding-to-about-the-future-mid-brain-region-coel-coelome-g-c-germinal-cells-med-pi-medullary-plate-mes-mesoblast-n-p-neural-fold-n-cr-neural-crest-nch-notochord-som-mes-somatic-layer-of-mesoblast-spl-image258886209.htmlRMW15801–Archive image from page 122 of The development of the chick. The development of the chick : an introduction to embryology . developmentofchi02lill Year: 1936 HEAD-FOLD TO TWELVE SOMITES 103 /? Cr /?. /- /? Cr. 26 efi'»:£ee »i t Coe/. .sc ;'' â ? yT/. ';': 6-:/ Fig. 57. â Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. P, Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl.
. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. DEVELOPMENT OF THE SKIN 561 (Dushane, '44). Experimental embryology strongly suggests that these chro- matophores are derived from the neural crest cells which in turn take origin from the primitive ectoderm in association with the neural tube at the time of neural tube closure. From the neural crests, the mesenchymal cells, which later give origin to chromatophores, migrate extensively throughout the body and to the skin areas (Dushane, '43, '44; Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/comparative-embryology-of-the-vertebrates-with-2057-drawings-and-photos-grouped-as-380-illus-vertebrates-embryology-comparative-embryology-development-of-the-skin-561-dushane-44-experimental-embryology-strongly-suggests-that-these-chro-matophores-are-derived-from-the-neural-crest-cells-which-in-turn-take-origin-from-the-primitive-ectoderm-in-association-with-the-neural-tube-at-the-time-of-neural-tube-closure-from-the-neural-crests-the-mesenchymal-cells-which-later-give-origin-to-chromatophores-migrate-extensively-throughout-the-body-and-to-the-skin-areas-dushane-43-44-image232675122.htmlRMREF7DP–. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. DEVELOPMENT OF THE SKIN 561 (Dushane, '44). Experimental embryology strongly suggests that these chro- matophores are derived from the neural crest cells which in turn take origin from the primitive ectoderm in association with the neural tube at the time of neural tube closure. From the neural crests, the mesenchymal cells, which later give origin to chromatophores, migrate extensively throughout the body and to the skin areas (Dushane, '43, '44;
![. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. K-'-: â :^:^%^. I â,-j*'''"'-3""-- Fig. 92. â Transverse section immediately be- hind the first visceral pouch of a chick embryo of thirteen somites. (After Gorono- witsch.) Note connection of the periaxial cord with the ectoderm of the visceral arch. Ad., Aorta descendens. c. Rounded me- senchyme cells, g. Place where cells derived from neural crest unite with the mesenchyme cells of the periaxial cord, f. Fusion, p. Spin- dle-shaped peripheral mesenchyme cells. the ectoderm in the Stock Photo](https://c8.alamy.com/comp/PFA81Y/the-development-of-the-chick-an-introduction-to-embryology-embryology-chickens-embryos-k-i-jquot-3quotquot-fig-92-transverse-section-immediately-be-hind-the-first-visceral-pouch-of-a-chick-embryo-of-thirteen-somites-after-gorono-witsch-note-connection-of-the-periaxial-cord-with-the-ectoderm-of-the-visceral-arch-ad-aorta-descendens-c-rounded-me-senchyme-cells-g-place-where-cells-derived-from-neural-crest-unite-with-the-mesenchyme-cells-of-the-periaxial-cord-f-fusion-p-spin-dle-shaped-peripheral-mesenchyme-cells-the-ectoderm-in-the-PFA81Y.jpg ". The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. K-'-: â :^:^%^. I â,-j*'''"'-3""-- Fig. 92. â Transverse section immediately be- hind the first visceral pouch of a chick embryo of thirteen somites. (After Gorono- witsch.) Note connection of the periaxial cord with the ectoderm of the visceral arch. Ad., Aorta descendens. c. Rounded me- senchyme cells, g. Place where cells derived from neural crest unite with the mesenchyme cells of the periaxial cord, f. Fusion, p. Spin- dle-shaped peripheral mesenchyme cells. the ectoderm in the Stock Photo")
. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. K-'-: â :^:^%^. I â,-j*'''"'-3""-- Fig. 92. â Transverse section immediately be- hind the first visceral pouch of a chick embryo of thirteen somites. (After Gorono- witsch.) Note connection of the periaxial cord with the ectoderm of the visceral arch. Ad., Aorta descendens. c. Rounded me- senchyme cells, g. Place where cells derived from neural crest unite with the mesenchyme cells of the periaxial cord, f. Fusion, p. Spin- dle-shaped peripheral mesenchyme cells. the ectoderm in the Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-chick-an-introduction-to-embryology-embryology-chickens-embryos-k-i-jquot-3quotquot-fig-92-transverse-section-immediately-be-hind-the-first-visceral-pouch-of-a-chick-embryo-of-thirteen-somites-after-gorono-witsch-note-connection-of-the-periaxial-cord-with-the-ectoderm-of-the-visceral-arch-ad-aorta-descendens-c-rounded-me-senchyme-cells-g-place-where-cells-derived-from-neural-crest-unite-with-the-mesenchyme-cells-of-the-periaxial-cord-f-fusion-p-spin-dle-shaped-peripheral-mesenchyme-cells-the-ectoderm-in-the-image215970103.htmlRMPFA81Y–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. K-'-: â :^:^%^. I â,-j*'''"'-3""-- Fig. 92. â Transverse section immediately be- hind the first visceral pouch of a chick embryo of thirteen somites. (After Gorono- witsch.) Note connection of the periaxial cord with the ectoderm of the visceral arch. Ad., Aorta descendens. c. Rounded me- senchyme cells, g. Place where cells derived from neural crest unite with the mesenchyme cells of the periaxial cord, f. Fusion, p. Spin- dle-shaped peripheral mesenchyme cells. the ectoderm in the
Archive image from page 122 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 HEAD-FOLD TO TWELVE SOMITES 103 /?/='. /?.0 r â gc. med.pl r-l /? Cr. -. f' ⢠«?sJ«> cl o/r?J/es. O 6 .?>;: yT/. 6'ce/ Fig. 57. â Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. F., Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic laye Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/archive-image-from-page-122-of-the-development-of-the-chick-the-development-of-the-chick-an-introduction-to-embryology-developmentofchi00lill-year-1908-head-fold-to-twelve-somites-103-=-0-r-gc-medpl-r-l-cr-f-sjgt-cl-orjes-o-6-gt-yt-6ce-fig-57-later-stage-of-the-neural-folds-section-through-the-head-of-an-embryo-of-2-3-s-corresponding-to-about-the-future-mid-brain-region-coel-coelome-g-c-germinal-cells-med-pi-medullary-plate-mes-mesoblast-n-f-neural-fold-n-cr-neural-crest-nch-notochord-som-mes-somatic-laye-image258886207.htmlRMW157YY–Archive image from page 122 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 HEAD-FOLD TO TWELVE SOMITES 103 /?/='. /?.0 r â gc. med.pl r-l /? Cr. -. f' ⢠«?sJ«> cl o/r?J/es. O 6 .?>;: yT/. 6'ce/ Fig. 57. â Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. F., Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic laye
. Analysis of development. Embryology; Embryology. Nervous System 371 occurs even in asymmetrically mutilated embryos under mechanically wholly aber- rant conditions (Holtzer, '51), it cannot be simply a mechanical accident, but must be viewed as a case of selective fusion of tis- sues according to their respective affinities (see Holtfreter, '39; Chiakvilas, '52). Simi- larly, the extrusion at this stage of the neural crest cells from the confines of the neural plate might be an expression of a cylindrical lumen. This actually occurs in isolated pieces of plate in homogeneous sur- roundings ( Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/analysis-of-development-embryology-embryology-nervous-system-371-occurs-even-in-asymmetrically-mutilated-embryos-under-mechanically-wholly-aber-rant-conditions-holtzer-51-it-cannot-be-simply-a-mechanical-accident-but-must-be-viewed-as-a-case-of-selective-fusion-of-tis-sues-according-to-their-respective-affinities-see-holtfreter-39-chiakvilas-52-simi-larly-the-extrusion-at-this-stage-of-the-neural-crest-cells-from-the-confines-of-the-neural-plate-might-be-an-expression-of-a-cylindrical-lumen-this-actually-occurs-in-isolated-pieces-of-plate-in-homogeneous-sur-roundings-image236874923.htmlRMRNAGAK–. Analysis of development. Embryology; Embryology. Nervous System 371 occurs even in asymmetrically mutilated embryos under mechanically wholly aber- rant conditions (Holtzer, '51), it cannot be simply a mechanical accident, but must be viewed as a case of selective fusion of tis- sues according to their respective affinities (see Holtfreter, '39; Chiakvilas, '52). Simi- larly, the extrusion at this stage of the neural crest cells from the confines of the neural plate might be an expression of a cylindrical lumen. This actually occurs in isolated pieces of plate in homogeneous sur- roundings (
![. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. .sc ^^^ ;'*' â ? yT^/. "^^;'^:^^*^ 6-^:^/ Fig. 57. â Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. P, Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Mes., Splanchnic layer of mesoblast. anterior end rapidly grows forward beyond the anterior end of the fore-gut. The floor of Stock Photo](https://c8.alamy.com/comp/PFA897/the-development-of-the-chick-an-introduction-to-embryology-embryology-chickens-embryos-sc-yt-quot-6-fig-57-later-stage-of-the-neural-folds-section-through-the-head-of-an-embryo-of-2-3-s-corresponding-to-about-the-future-mid-brain-region-coel-coelome-g-c-germinal-cells-med-pi-medullary-plate-mes-mesoblast-n-p-neural-fold-n-cr-neural-crest-nch-notochord-som-mes-somatic-layer-of-mesoblast-spl-mes-splanchnic-layer-of-mesoblast-anterior-end-rapidly-grows-forward-beyond-the-anterior-end-of-the-fore-gut-the-floor-of-PFA897.jpg ". The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. .sc ^^^ ;'*' â ? yT^/. "^^;'^:^^*^ 6-^:^/ Fig. 57. â Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. P, Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Mes., Splanchnic layer of mesoblast. anterior end rapidly grows forward beyond the anterior end of the fore-gut. The floor of Stock Photo")
. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. .sc ^^^ ;'*' â ? yT^/. "^^;'^:^^*^ 6-^:^/ Fig. 57. â Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. P, Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Mes., Splanchnic layer of mesoblast. anterior end rapidly grows forward beyond the anterior end of the fore-gut. The floor of Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-chick-an-introduction-to-embryology-embryology-chickens-embryos-sc-yt-quot-6-fig-57-later-stage-of-the-neural-folds-section-through-the-head-of-an-embryo-of-2-3-s-corresponding-to-about-the-future-mid-brain-region-coel-coelome-g-c-germinal-cells-med-pi-medullary-plate-mes-mesoblast-n-p-neural-fold-n-cr-neural-crest-nch-notochord-som-mes-somatic-layer-of-mesoblast-spl-mes-splanchnic-layer-of-mesoblast-anterior-end-rapidly-grows-forward-beyond-the-anterior-end-of-the-fore-gut-the-floor-of-image215970307.htmlRMPFA897–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. .sc ^^^ ;'*' â ? yT^/. "^^;'^:^^*^ 6-^:^/ Fig. 57. â Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. P, Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Mes., Splanchnic layer of mesoblast. anterior end rapidly grows forward beyond the anterior end of the fore-gut. The floor of
. Animal growth and development. Embryology; Growth; Biology; Growth; Embryology; Animals -- growth & development. Forebrain Midbrain Hindbrain. Ear primordi Fig. 33. The development of the brain and associated sense organs (after Wad- dington). organs and tissues. Cells that had previously been crowded out of the neural folds (the neural crest cells in Fig. 31) migrate down toward the cord and aggregate into cell masses called ganglia. These cells become sensory neurons and send dendrites to connect up with the dorsal part of the spinal cord and axons into surrounding tissues. In this man Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/animal-growth-and-development-embryology-growth-biology-growth-embryology-animals-growth-amp-development-forebrain-midbrain-hindbrain-ear-primordi-fig-33-the-development-of-the-brain-and-associated-sense-organs-after-wad-dington-organs-and-tissues-cells-that-had-previously-been-crowded-out-of-the-neural-folds-the-neural-crest-cells-in-fig-31-migrate-down-toward-the-cord-and-aggregate-into-cell-masses-called-ganglia-these-cells-become-sensory-neurons-and-send-dendrites-to-connect-up-with-the-dorsal-part-of-the-spinal-cord-and-axons-into-surrounding-tissues-in-this-man-image236771840.htmlRMRN5TW4–. Animal growth and development. Embryology; Growth; Biology; Growth; Embryology; Animals -- growth & development. Forebrain Midbrain Hindbrain. Ear primordi Fig. 33. The development of the brain and associated sense organs (after Wad- dington). organs and tissues. Cells that had previously been crowded out of the neural folds (the neural crest cells in Fig. 31) migrate down toward the cord and aggregate into cell masses called ganglia. These cells become sensory neurons and send dendrites to connect up with the dorsal part of the spinal cord and axons into surrounding tissues. In this man
![. The development of the chick; an introduction to embryology. Birds -- Embryology. ^^^^^^^ ^cl ^o/r?J/es. O 6^ ^.?>;^: yT^/. 6"ce/ Fig. 57. — Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. F., Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Mes., Splanchnic layer of mesoblast. anterior end rapidly grows forward beyond the anterior end of the fore-gut. The floor of the Stock Photo](https://c8.alamy.com/comp/PFA8CE/the-development-of-the-chick-an-introduction-to-embryology-birds-embryology-cl-orjes-o-6-gt-yt-6quotce-fig-57-later-stage-of-the-neural-folds-section-through-the-head-of-an-embryo-of-2-3-s-corresponding-to-about-the-future-mid-brain-region-coel-coelome-g-c-germinal-cells-med-pi-medullary-plate-mes-mesoblast-n-f-neural-fold-n-cr-neural-crest-nch-notochord-som-mes-somatic-layer-of-mesoblast-spl-mes-splanchnic-layer-of-mesoblast-anterior-end-rapidly-grows-forward-beyond-the-anterior-end-of-the-fore-gut-the-floor-of-the-PFA8CE.jpg ". The development of the chick; an introduction to embryology. Birds -- Embryology. ^^^^^^^ ^cl ^o/r?J/es. O 6^ ^.?>;^: yT^/. 6"ce/ Fig. 57. — Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. F., Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Mes., Splanchnic layer of mesoblast. anterior end rapidly grows forward beyond the anterior end of the fore-gut. The floor of the Stock Photo")
. The development of the chick; an introduction to embryology. Birds -- Embryology. ^^^^^^^ ^cl ^o/r?J/es. O 6^ ^.?>;^: yT^/. 6"ce/ Fig. 57. — Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. F., Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Mes., Splanchnic layer of mesoblast. anterior end rapidly grows forward beyond the anterior end of the fore-gut. The floor of the Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-chick-an-introduction-to-embryology-birds-embryology-cl-orjes-o-6-gt-yt-6quotce-fig-57-later-stage-of-the-neural-folds-section-through-the-head-of-an-embryo-of-2-3-s-corresponding-to-about-the-future-mid-brain-region-coel-coelome-g-c-germinal-cells-med-pi-medullary-plate-mes-mesoblast-n-f-neural-fold-n-cr-neural-crest-nch-notochord-som-mes-somatic-layer-of-mesoblast-spl-mes-splanchnic-layer-of-mesoblast-anterior-end-rapidly-grows-forward-beyond-the-anterior-end-of-the-fore-gut-the-floor-of-the-image215970398.htmlRMPFA8CE–. The development of the chick; an introduction to embryology. Birds -- Embryology. ^^^^^^^ ^cl ^o/r?J/es. O 6^ ^.?>;^: yT^/. 6"ce/ Fig. 57. — Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. F., Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Mes., Splanchnic layer of mesoblast. anterior end rapidly grows forward beyond the anterior end of the fore-gut. The floor of the
. Bulletin. Natural history; Natuurlijke historie. Fig. 2L Diagrams showing the possible sequence of cell migrations and inductions in the formation of cosmine. A) Migrating neural-crest cells arrive at the dermis-epidermis interface and become arranged in discrete groups to form, eventually, the neuromast organs. B) A second wave of neural-crest cells arrives and become distributed evenly in the uppermost part of the dermis. These induce the overlying epidermal layer to form a dental epithelium, except where interrupted by the neuromast precursors. C) The dental epithelium is formed and reind Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/bulletin-natural-history-natuurlijke-historie-fig-2l-diagrams-showing-the-possible-sequence-of-cell-migrations-and-inductions-in-the-formation-of-cosmine-a-migrating-neural-crest-cells-arrive-at-the-dermis-epidermis-interface-and-become-arranged-in-discrete-groups-to-form-eventually-the-neuromast-organs-b-a-second-wave-of-neural-crest-cells-arrives-and-become-distributed-evenly-in-the-uppermost-part-of-the-dermis-these-induce-the-overlying-epidermal-layer-to-form-a-dental-epithelium-except-where-interrupted-by-the-neuromast-precursors-c-the-dental-epithelium-is-formed-and-reind-image234210210.htmlRMRH15EA–. Bulletin. Natural history; Natuurlijke historie. Fig. 2L Diagrams showing the possible sequence of cell migrations and inductions in the formation of cosmine. A) Migrating neural-crest cells arrive at the dermis-epidermis interface and become arranged in discrete groups to form, eventually, the neuromast organs. B) A second wave of neural-crest cells arrives and become distributed evenly in the uppermost part of the dermis. These induce the overlying epidermal layer to form a dental epithelium, except where interrupted by the neuromast precursors. C) The dental epithelium is formed and reind
![. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. HEAD-FOLD TO TWELVE SOMITES 103 /? Cr /?. /- /? Cr. 26 efi"»:£ee »i^ t^ Coe/.. .sc ^^^ ;'*' â ? yT^/. "^^;'^:^^*^ 6-^:^/ Fig. 57. â Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. P, Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Mes., Splanchnic layer of mesoblast. a Stock Photo](https://c8.alamy.com/comp/PFA892/the-development-of-the-chick-an-introduction-to-embryology-embryology-chickens-embryos-head-fold-to-twelve-somites-103-cr-cr-26-efiquotee-i-t-coe-sc-yt-quot-6-fig-57-later-stage-of-the-neural-folds-section-through-the-head-of-an-embryo-of-2-3-s-corresponding-to-about-the-future-mid-brain-region-coel-coelome-g-c-germinal-cells-med-pi-medullary-plate-mes-mesoblast-n-p-neural-fold-n-cr-neural-crest-nch-notochord-som-mes-somatic-layer-of-mesoblast-spl-mes-splanchnic-layer-of-mesoblast-a-PFA892.jpg ". The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. HEAD-FOLD TO TWELVE SOMITES 103 /? Cr /?. /- /? Cr. 26 efi"»:£ee »i^ t^ Coe/.. .sc ^^^ ;'*' â ? yT^/. "^^;'^:^^*^ 6-^:^/ Fig. 57. â Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. P, Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Mes., Splanchnic layer of mesoblast. a Stock Photo")
. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. HEAD-FOLD TO TWELVE SOMITES 103 /? Cr /?. /- /? Cr. 26 efi"»:£ee »i^ t^ Coe/.. .sc ^^^ ;'*' â ? yT^/. "^^;'^:^^*^ 6-^:^/ Fig. 57. â Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. P, Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Mes., Splanchnic layer of mesoblast. a Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-chick-an-introduction-to-embryology-embryology-chickens-embryos-head-fold-to-twelve-somites-103-cr-cr-26-efiquotee-i-t-coe-sc-yt-quot-6-fig-57-later-stage-of-the-neural-folds-section-through-the-head-of-an-embryo-of-2-3-s-corresponding-to-about-the-future-mid-brain-region-coel-coelome-g-c-germinal-cells-med-pi-medullary-plate-mes-mesoblast-n-p-neural-fold-n-cr-neural-crest-nch-notochord-som-mes-somatic-layer-of-mesoblast-spl-mes-splanchnic-layer-of-mesoblast-a-image215970302.htmlRMPFA892–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. HEAD-FOLD TO TWELVE SOMITES 103 /? Cr /?. /- /? Cr. 26 efi"»:£ee »i^ t^ Coe/.. .sc ^^^ ;'*' â ? yT^/. "^^;'^:^^*^ 6-^:^/ Fig. 57. â Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. P, Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Mes., Splanchnic layer of mesoblast. a
. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. VAGUS LATERAL LINE PLACODES EPI BRANCHIAL PLACODES OF N VAGUS ^OTIC VESICLE -!V LATERAL LINE PLACODE LONGITUDINAL ECTODERMAL THICKENING ECTODERMAL THICKENING HYOMANOIBULAR CLEFT EPIBRANCHIAL PLACODE GLOSSOPHARYNGEUS FACIALIS D. SUPRAORBITAL GROUP OF SENSE ORGANS MIOBODY LINE OF SENSE ORGANS Fig. 222. Neural crest cells in Ainbystoma piinctatum. (A and B from Johnston: Nervous System of Vertebrates, Philadelphia, Blakiston, '06; C-F from Stone: J. Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/comparative-embryology-of-the-vertebrates-with-2057-drawings-and-photos-grouped-as-380-illus-vertebrates-embryology-comparative-embryology-vagus-lateral-line-placodes-epi-branchial-placodes-of-n-vagus-otic-vesicle-!v-lateral-line-placode-longitudinal-ectodermal-thickening-ectodermal-thickening-hyomanoibular-cleft-epibranchial-placode-glossopharyngeus-facialis-d-supraorbital-group-of-sense-organs-miobody-line-of-sense-organs-fig-222-neural-crest-cells-in-ainbystoma-piinctatum-a-and-b-from-johnston-nervous-system-of-vertebrates-philadelphia-blakiston-06-c-f-from-stone-j-image232675535.htmlRMREF80F–. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. VAGUS LATERAL LINE PLACODES EPI BRANCHIAL PLACODES OF N VAGUS ^OTIC VESICLE -!V LATERAL LINE PLACODE LONGITUDINAL ECTODERMAL THICKENING ECTODERMAL THICKENING HYOMANOIBULAR CLEFT EPIBRANCHIAL PLACODE GLOSSOPHARYNGEUS FACIALIS D. SUPRAORBITAL GROUP OF SENSE ORGANS MIOBODY LINE OF SENSE ORGANS Fig. 222. Neural crest cells in Ainbystoma piinctatum. (A and B from Johnston: Nervous System of Vertebrates, Philadelphia, Blakiston, '06; C-F from Stone: J.
![. The development of the chick; an introduction to embryology. Birds -- Embryology. HEAD-FOLD TO TWELVE SOMITES 103 /?/='. /?.0 r â gc. med.pl r-l /? Cr. -. f" â¢** «^?s*J«>. ^^^^^^^ ^cl ^o/r?J/es. O 6^ ^.?>;^: yT^/. 6"ce/ Fig. 57. â Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. F., Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Mes., Splanchnic layer of mes Stock Photo](https://c8.alamy.com/comp/PFA8CH/the-development-of-the-chick-an-introduction-to-embryology-birds-embryology-head-fold-to-twelve-somites-103-=-0-r-gc-medpl-r-l-cr-fquot-sjgt-cl-orjes-o-6-gt-yt-6quotce-fig-57-later-stage-of-the-neural-folds-section-through-the-head-of-an-embryo-of-2-3-s-corresponding-to-about-the-future-mid-brain-region-coel-coelome-g-c-germinal-cells-med-pi-medullary-plate-mes-mesoblast-n-f-neural-fold-n-cr-neural-crest-nch-notochord-som-mes-somatic-layer-of-mesoblast-spl-mes-splanchnic-layer-of-mes-PFA8CH.jpg ". The development of the chick; an introduction to embryology. Birds -- Embryology. HEAD-FOLD TO TWELVE SOMITES 103 /?/='. /?.0 r â gc. med.pl r-l /? Cr. -. f" â¢** «^?s*J«>. ^^^^^^^ ^cl ^o/r?J/es. O 6^ ^.?>;^: yT^/. 6"ce/ Fig. 57. â Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. F., Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Mes., Splanchnic layer of mes Stock Photo")
. The development of the chick; an introduction to embryology. Birds -- Embryology. HEAD-FOLD TO TWELVE SOMITES 103 /?/='. /?.0 r â gc. med.pl r-l /? Cr. -. f" â¢** «^?s*J«>. ^^^^^^^ ^cl ^o/r?J/es. O 6^ ^.?>;^: yT^/. 6"ce/ Fig. 57. â Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. F., Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Mes., Splanchnic layer of mes Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-chick-an-introduction-to-embryology-birds-embryology-head-fold-to-twelve-somites-103-=-0-r-gc-medpl-r-l-cr-fquot-sjgt-cl-orjes-o-6-gt-yt-6quotce-fig-57-later-stage-of-the-neural-folds-section-through-the-head-of-an-embryo-of-2-3-s-corresponding-to-about-the-future-mid-brain-region-coel-coelome-g-c-germinal-cells-med-pi-medullary-plate-mes-mesoblast-n-f-neural-fold-n-cr-neural-crest-nch-notochord-som-mes-somatic-layer-of-mesoblast-spl-mes-splanchnic-layer-of-mes-image215970401.htmlRMPFA8CH–. The development of the chick; an introduction to embryology. Birds -- Embryology. HEAD-FOLD TO TWELVE SOMITES 103 /?/='. /?.0 r â gc. med.pl r-l /? Cr. -. f" â¢** «^?s*J«>. ^^^^^^^ ^cl ^o/r?J/es. O 6^ ^.?>;^: yT^/. 6"ce/ Fig. 57. â Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. F., Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Mes., Splanchnic layer of mes
. Comparative anatomy. Anatomy, Comparative. Fic;. 512.—A parasagittal section of a 33-hour chick embryo showing the brain neuro- meres. The neuromeres are indicated by Roman numerals. Among the criteria used to determine head segmentation, some morphologists have leaned heavily upon the so-called neuromeres or segments of the central nervous system. Neuromeres are evanescent 'NEURAL CREST CELLS/ NEUROMERES. Fig. 513.—A reconstruction of the head region of a 5 mm. Squalus embryo showing neuromeres and van Wijhe's somites as viewed from the left side. Neural crest cells are indicated by heavy b Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/comparative-anatomy-anatomy-comparative-fic-512a-parasagittal-section-of-a-33-hour-chick-embryo-showing-the-brain-neuro-meres-the-neuromeres-are-indicated-by-roman-numerals-among-the-criteria-used-to-determine-head-segmentation-some-morphologists-have-leaned-heavily-upon-the-so-called-neuromeres-or-segments-of-the-central-nervous-system-neuromeres-are-evanescent-neural-crest-cells-neuromeres-fig-513a-reconstruction-of-the-head-region-of-a-5-mm-squalus-embryo-showing-neuromeres-and-van-wijhes-somites-as-viewed-from-the-left-side-neural-crest-cells-are-indicated-by-heavy-b-image232674391.htmlRMREF6FK–. Comparative anatomy. Anatomy, Comparative. Fic;. 512.—A parasagittal section of a 33-hour chick embryo showing the brain neuro- meres. The neuromeres are indicated by Roman numerals. Among the criteria used to determine head segmentation, some morphologists have leaned heavily upon the so-called neuromeres or segments of the central nervous system. Neuromeres are evanescent 'NEURAL CREST CELLS/ NEUROMERES. Fig. 513.—A reconstruction of the head region of a 5 mm. Squalus embryo showing neuromeres and van Wijhe's somites as viewed from the left side. Neural crest cells are indicated by heavy b
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ANALYSIS OF PIGMENT SUPPRESSION 131 Series 2. Duration oj mutual antagonisms between chromatophores in vivo: In order to discover whether the age and distribution of older neural crest cells would influence the migration of younger cells within the embryo, three series of transplantations were carried out. They involve the grafting of identical pieces of Stage 23 A. punctatum trunk neural crest unilaterally onto the flank at the yolk border of Stage 24, 32. and 37 + T. rivularis embryos. Series 2a. Stage 23 A. pnnctatuin neu Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-biological-bulletin-biology-zoology-biology-marine-biology-analysis-of-pigment-suppression-131-series-2-duration-oj-mutual-antagonisms-between-chromatophores-in-vivo-in-order-to-discover-whether-the-age-and-distribution-of-older-neural-crest-cells-would-influence-the-migration-of-younger-cells-within-the-embryo-three-series-of-transplantations-were-carried-out-they-involve-the-grafting-of-identical-pieces-of-stage-23-a-punctatum-trunk-neural-crest-unilaterally-onto-the-flank-at-the-yolk-border-of-stage-24-32-and-37-t-rivularis-embryos-series-2a-stage-23-a-pnnctatuin-neu-image234667980.htmlRMRHP1B8–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ANALYSIS OF PIGMENT SUPPRESSION 131 Series 2. Duration oj mutual antagonisms between chromatophores in vivo: In order to discover whether the age and distribution of older neural crest cells would influence the migration of younger cells within the embryo, three series of transplantations were carried out. They involve the grafting of identical pieces of Stage 23 A. punctatum trunk neural crest unilaterally onto the flank at the yolk border of Stage 24, 32. and 37 + T. rivularis embryos. Series 2a. Stage 23 A. pnnctatuin neu
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 0 mV/mm 0.08±0.07 (111) 90 270. Figure 1. The translocation response of 56-h-old neural crest cells during a 2-h period in the indicated electric field strength. After tracing from a video screen the position of each cell before and after 2 hours in the field, the initial point was placed at the origin and the final location plotted as a single point on the circular graph. The radius of each circle represents 1 mm of translocation distance and the average cell length is 60 ^m. The applied field strength, average cosine of th Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-biological-bulletin-biology-zoology-biology-marine-biology-0-mvmm-008007-111-90-270-figure-1-the-translocation-response-of-56-h-old-neural-crest-cells-during-a-2-h-period-in-the-indicated-electric-field-strength-after-tracing-from-a-video-screen-the-position-of-each-cell-before-and-after-2-hours-in-the-field-the-initial-point-was-placed-at-the-origin-and-the-final-location-plotted-as-a-single-point-on-the-circular-graph-the-radius-of-each-circle-represents-1-mm-of-translocation-distance-and-the-average-cell-length-is-60-m-the-applied-field-strength-average-cosine-of-th-image234542044.htmlRMRHG8NG–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 0 mV/mm 0.08±0.07 (111) 90 270. Figure 1. The translocation response of 56-h-old neural crest cells during a 2-h period in the indicated electric field strength. After tracing from a video screen the position of each cell before and after 2 hours in the field, the initial point was placed at the origin and the final location plotted as a single point on the circular graph. The radius of each circle represents 1 mm of translocation distance and the average cell length is 60 ^m. The applied field strength, average cosine of th
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. R. NUCCITELLI AND T. SMART 400mV mm B 0.76 ±0.03 (170) 10mM MgCl2 400 mV mm 0.02 ± 0.05 (204) 90 270 tOOuM Gadolllnlum 400 mV mm 0.00 ± 0.05 (183). i Ca2+-lree (2mM EGTA, 10mM 400 mV mm -0.24 ± 0.06 (152) Figure 3. The translocation response of 2-day-old neural crest cells during a 2-h period in an imposed d.c. field of 400 mV/mm. The scale marks on the axes represent 200 ^m and the average cell length^is 60 Mm. A. Control in normal F12 medium. B. F12 was supplemented with 10 mM Mg2+ in normal Ca2+. C. F12 was supplemented w Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-biological-bulletin-biology-zoology-biology-marine-biology-r-nuccitelli-and-t-smart-400mv-mm-b-076-003-170-10mm-mgcl2-400-mv-mm-002-005-204-90-270-tooum-gadolllnlum-400-mv-mm-000-005-183-i-ca2-lree-2mm-egta-10mm-400-mv-mm-024-006-152-figure-3-the-translocation-response-of-2-day-old-neural-crest-cells-during-a-2-h-period-in-an-imposed-dc-field-of-400-mvmm-the-scale-marks-on-the-axes-represent-200-m-and-the-average-cell-lengthis-60-mm-a-control-in-normal-f12-medium-b-f12-was-supplemented-with-10-mm-mg2-in-normal-ca2-c-f12-was-supplemented-w-image234542026.htmlRMRHG8MX–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. R. NUCCITELLI AND T. SMART 400mV mm B 0.76 ±0.03 (170) 10mM MgCl2 400 mV mm 0.02 ± 0.05 (204) 90 270 tOOuM Gadolllnlum 400 mV mm 0.00 ± 0.05 (183). i Ca2+-lree (2mM EGTA, 10mM 400 mV mm -0.24 ± 0.06 (152) Figure 3. The translocation response of 2-day-old neural crest cells during a 2-h period in an imposed d.c. field of 400 mV/mm. The scale marks on the axes represent 200 ^m and the average cell length^is 60 Mm. A. Control in normal F12 medium. B. F12 was supplemented with 10 mM Mg2+ in normal Ca2+. C. F12 was supplemented w
The anatomy of the nervous system, from the standpoint of development and function . less conspicuous element. A few cells retain the bipolar form characteristic of all the spinal ganglioncells at an early stage of development (Figs. 21, 40, d). The spinal ganglion cells are each surrounded by a capsule or membranoussheath with nuclei on its inner surface (Fig. 39, d.f) which is continuous withthe neurilemma sheath of the associated nerve-fiber. The cells forming thecapsule are of ectodermal origin, being derived like the spinal ganglion cellsthemselves from the neural crest. 1 See fine print, Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-anatomy-of-the-nervous-system-from-the-standpoint-of-development-and-function-less-conspicuous-element-a-few-cells-retain-the-bipolar-form-characteristic-of-all-the-spinal-ganglioncells-at-an-early-stage-of-development-figs-21-40-d-the-spinal-ganglion-cells-are-each-surrounded-by-a-capsule-or-membranoussheath-with-nuclei-on-its-inner-surface-fig-39-df-which-is-continuous-withthe-neurilemma-sheath-of-the-associated-nerve-fiber-the-cells-forming-thecapsule-are-of-ectodermal-origin-being-derived-like-the-spinal-ganglion-cellsthemselves-from-the-neural-crest-1-see-fine-print-image342757552.htmlRM2AWHXN4–The anatomy of the nervous system, from the standpoint of development and function . less conspicuous element. A few cells retain the bipolar form characteristic of all the spinal ganglioncells at an early stage of development (Figs. 21, 40, d). The spinal ganglion cells are each surrounded by a capsule or membranoussheath with nuclei on its inner surface (Fig. 39, d.f) which is continuous withthe neurilemma sheath of the associated nerve-fiber. The cells forming thecapsule are of ectodermal origin, being derived like the spinal ganglion cellsthemselves from the neural crest. 1 See fine print,
The anatomy of the nervous system, from the standpoint of development and function . al direction as a motor axon. In this way the motor fibers of the cere-brospinal nerves are laid down. The axis-cylinder of each represents a processwhich has grown out from a neuroblast in the basal plate of the neural tube. Development of Afferent Neurons.—The sensory or afferent libers of thespinal nerves take origin from neuroblasts which are from the beginning out-side the neural tube. These neuroblasts are derived from the neural crest, alongitudinal ridge of ectodermal cells at the margin of the neural Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-anatomy-of-the-nervous-system-from-the-standpoint-of-development-and-function-al-direction-as-a-motor-axon-in-this-way-the-motor-fibers-of-the-cere-brospinal-nerves-are-laid-down-the-axis-cylinder-of-each-represents-a-processwhich-has-grown-out-from-a-neuroblast-in-the-basal-plate-of-the-neural-tube-development-of-afferent-neuronsthe-sensory-or-afferent-libers-of-thespinal-nerves-take-origin-from-neuroblasts-which-are-from-the-beginning-out-side-the-neural-tube-these-neuroblasts-are-derived-from-the-neural-crest-alongitudinal-ridge-of-ectodermal-cells-at-the-margin-of-the-neural-image342768042.htmlRM2AWJC3P–The anatomy of the nervous system, from the standpoint of development and function . al direction as a motor axon. In this way the motor fibers of the cere-brospinal nerves are laid down. The axis-cylinder of each represents a processwhich has grown out from a neuroblast in the basal plate of the neural tube. Development of Afferent Neurons.—The sensory or afferent libers of thespinal nerves take origin from neuroblasts which are from the beginning out-side the neural tube. These neuroblasts are derived from the neural crest, alongitudinal ridge of ectodermal cells at the margin of the neural
A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . Canalisneurentericus Pedunculus abdominalis Fig. 874.—Neural Plate in an Embryo of Five to Six PrimitiveSegments. (After Keibel and KIze, from Keibel and MallsHaudbuch der Eutmckluug^ge^chichte des Menschen.) gives rise to sensory fibers for deep sensibility in themuscles of the head. In fishes some of the ganglia of the cerebral nervesreceive cells both from the neural crest and fromectodermal placodes which are arranged in two seriesalong the side of the head, a Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/a-reference-handbook-of-the-medical-sciences-embracing-the-entire-range-of-scientific-and-practical-medicine-and-allied-science-canalisneurentericus-pedunculus-abdominalis-fig-874neural-plate-in-an-embryo-of-five-to-six-primitivesegments-after-keibel-and-kize-from-keibel-and-mallshaudbuch-der-eutmckluuggechichte-des-menschen-gives-rise-to-sensory-fibers-for-deep-sensibility-in-themuscles-of-the-head-in-fishes-some-of-the-ganglia-of-the-cerebral-nervesreceive-cells-both-from-the-neural-crest-and-fromectodermal-placodes-which-are-arranged-in-two-seriesalong-the-side-of-the-head-a-image338934924.htmlRM2AKBPXM–A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . Canalisneurentericus Pedunculus abdominalis Fig. 874.—Neural Plate in an Embryo of Five to Six PrimitiveSegments. (After Keibel and KIze, from Keibel and MallsHaudbuch der Eutmckluug^ge^chichte des Menschen.) gives rise to sensory fibers for deep sensibility in themuscles of the head. In fishes some of the ganglia of the cerebral nervesreceive cells both from the neural crest and fromectodermal placodes which are arranged in two seriesalong the side of the head, a
The development of the human body; a manual of human embryology . sed (Fig. 42), the cells which lie alongthe line of transition between the lips of the groove andthe general ectoderm form a distinct ridge readily recog-nized in sections andtermed the neural ridge(Fig. 213, A). When thelips of the groove fusetogether the cells of thecrest unite to form awedge-shaped mass, completing the closureof the canal (Fig. 213,B), and later proliferateso as to extend outwardover the surface of thecanal (Fig. 213, C).Since this proliferationis most active in the re-gions of the crest whichcorrespond to th Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-human-body-a-manual-of-human-embryology-sed-fig-42-the-cells-which-lie-alongthe-line-of-transition-between-the-lips-of-the-groove-andthe-general-ectoderm-form-a-distinct-ridge-readily-recog-nized-in-sections-andtermed-the-neural-ridgefig-213-a-when-thelips-of-the-groove-fusetogether-the-cells-of-thecrest-unite-to-form-awedge-shaped-mass-completing-the-closureof-the-canal-fig-213b-and-later-proliferateso-as-to-extend-outwardover-the-surface-of-thecanal-fig-213-csince-this-proliferationis-most-active-in-the-re-gions-of-the-crest-whichcorrespond-to-th-image342647407.htmlRM2AWCX7B–The development of the human body; a manual of human embryology . sed (Fig. 42), the cells which lie alongthe line of transition between the lips of the groove andthe general ectoderm form a distinct ridge readily recog-nized in sections andtermed the neural ridge(Fig. 213, A). When thelips of the groove fusetogether the cells of thecrest unite to form awedge-shaped mass, completing the closureof the canal (Fig. 213,B), and later proliferateso as to extend outwardover the surface of thecanal (Fig. 213, C).Since this proliferationis most active in the re-gions of the crest whichcorrespond to th
. The development of the chick; an introduction to embryology . primordia of the cerebral gan-glia, and siniilai- successively arising enlargements of the partsof the crest opposite the mesoblastic somites form the rudimentsof the spinal ganglia. The intervening portions of the crest formthe so-called interganglionic commissures, which subsequently FROM TWELVE TO THIRTY-SIX SOMITES 157 appear to form mesenchyme. The formation of mesenchymefrom certain parts of the neural crest is most marked in theregion of the brain. The primordia of the ganglia contain the cells (neuroblasts)which form the d Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-chick-an-introduction-to-embryology-primordia-of-the-cerebral-gan-glia-and-siniilai-successively-arising-enlargements-of-the-partsof-the-crest-opposite-the-mesoblastic-somites-form-the-rudimentsof-the-spinal-ganglia-the-intervening-portions-of-the-crest-formthe-so-called-interganglionic-commissures-which-subsequently-from-twelve-to-thirty-six-somites-157-appear-to-form-mesenchyme-the-formation-of-mesenchymefrom-certain-parts-of-the-neural-crest-is-most-marked-in-theregion-of-the-brain-the-primordia-of-the-ganglia-contain-the-cells-neuroblastswhich-form-the-d-image375412051.htmlRM2CPNDW7–. The development of the chick; an introduction to embryology . primordia of the cerebral gan-glia, and siniilai- successively arising enlargements of the partsof the crest opposite the mesoblastic somites form the rudimentsof the spinal ganglia. The intervening portions of the crest formthe so-called interganglionic commissures, which subsequently FROM TWELVE TO THIRTY-SIX SOMITES 157 appear to form mesenchyme. The formation of mesenchymefrom certain parts of the neural crest is most marked in theregion of the brain. The primordia of the ganglia contain the cells (neuroblasts)which form the d
. The development of the chick; an introduction to embryology . f the cerebral gan-glia, and similar successively arising enlargements of the partsof the crest opposite the mesoblastic somites form the rudimentsof the spinal ganglia. The intervening portions of the crest formthe so-called interganglionic commissures, which subsequently FRO:I TWELVE TO THIRTY-SIX SOMITES 157 appear to form mesenchyme. The formation of mesenchymefrom certain parts of the neural crest is most marked in theregion of the brain. The primordia of the gangUa contain the cells (neuroblasts)which form the dorsal root f Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-chick-an-introduction-to-embryology-f-the-cerebral-gan-glia-and-similar-successively-arising-enlargements-of-the-partsof-the-crest-opposite-the-mesoblastic-somites-form-the-rudimentsof-the-spinal-ganglia-the-intervening-portions-of-the-crest-formthe-so-called-interganglionic-commissures-which-subsequently-froi-twelve-to-thirty-six-somites-157-appear-to-form-mesenchyme-the-formation-of-mesenchymefrom-certain-parts-of-the-neural-crest-is-most-marked-in-theregion-of-the-brain-the-primordia-of-the-gangua-contain-the-cells-neuroblastswhich-form-the-dorsal-root-f-image374665374.htmlRM2CNFDE6–. The development of the chick; an introduction to embryology . f the cerebral gan-glia, and similar successively arising enlargements of the partsof the crest opposite the mesoblastic somites form the rudimentsof the spinal ganglia. The intervening portions of the crest formthe so-called interganglionic commissures, which subsequently FRO:I TWELVE TO THIRTY-SIX SOMITES 157 appear to form mesenchyme. The formation of mesenchymefrom certain parts of the neural crest is most marked in theregion of the brain. The primordia of the gangUa contain the cells (neuroblasts)which form the dorsal root f
. The development of the chick; an introduction to embryology . ave been established; indeed, therhythmical pulsation begins at about the stage of 10 somiteswhen the neural crest is yet undifferentiated, and no neuroblastsare to be found anywhere. Either, then, the heart-beat is of mus-cular origin (myogenic), or, if of nervous origin, the nerve-cellsconcerned must exist in the wall of the cardiac tube ah initio. The first trace of nerve-cells is found in the heart of the chickabout the sixth day. These cells are at the distal ends of branchesof the vagus, with which they have grown into the h Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-chick-an-introduction-to-embryology-ave-been-established-indeed-therhythmical-pulsation-begins-at-about-the-stage-of-10-somiteswhen-the-neural-crest-is-yet-undifferentiated-and-no-neuroblastsare-to-be-found-anywhere-either-then-the-heart-beat-is-of-mus-cular-origin-myogenic-or-if-of-nervous-origin-the-nerve-cellsconcerned-must-exist-in-the-wall-of-the-cardiac-tube-ah-initio-the-first-trace-of-nerve-cells-is-found-in-the-heart-of-the-chickabout-the-sixth-day-these-cells-are-at-the-distal-ends-of-branchesof-the-vagus-with-which-they-have-grown-into-the-h-image374659612.htmlRM2CNF64C–. The development of the chick; an introduction to embryology . ave been established; indeed, therhythmical pulsation begins at about the stage of 10 somiteswhen the neural crest is yet undifferentiated, and no neuroblastsare to be found anywhere. Either, then, the heart-beat is of mus-cular origin (myogenic), or, if of nervous origin, the nerve-cellsconcerned must exist in the wall of the cardiac tube ah initio. The first trace of nerve-cells is found in the heart of the chickabout the sixth day. These cells are at the distal ends of branchesof the vagus, with which they have grown into the h
. Quain's elements of anatomy . the anterior roots spring from the spinal cord isnot opposite to the corresponding posterior root, but midway betweenthat root and the succeeding one. Both roots and ganglion have at firsta cellular structure, and their fibres are of later origin, the cells being-largest in the ganglion, and the fibres appearing earlier in the anteriorthan in the posterior roots. Cranial Nerves.—Most of the cranial nerves, viz., the olfactory, the3rd, 5th, and 7th, the auditory, the glossopharyngeal, and the vagus,arise fiom a neural crest in a manner analogous to the spinal pos Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/quains-elements-of-anatomy-the-anterior-roots-spring-from-the-spinal-cord-isnot-opposite-to-the-corresponding-posterior-root-but-midway-betweenthat-root-and-the-succeeding-one-both-roots-and-ganglion-have-at-firsta-cellular-structure-and-their-fibres-are-of-later-origin-the-cells-being-largest-in-the-ganglion-and-the-fibres-appearing-earlier-in-the-anteriorthan-in-the-posterior-roots-cranial-nervesmost-of-the-cranial-nerves-viz-the-olfactory-the3rd-5th-and-7th-the-auditory-the-glossopharyngeal-and-the-vagusarise-fiom-a-neural-crest-in-a-manner-analogous-to-the-spinal-pos-image371842258.htmlRM2CGXTGJ–. Quain's elements of anatomy . the anterior roots spring from the spinal cord isnot opposite to the corresponding posterior root, but midway betweenthat root and the succeeding one. Both roots and ganglion have at firsta cellular structure, and their fibres are of later origin, the cells being-largest in the ganglion, and the fibres appearing earlier in the anteriorthan in the posterior roots. Cranial Nerves.—Most of the cranial nerves, viz., the olfactory, the3rd, 5th, and 7th, the auditory, the glossopharyngeal, and the vagus,arise fiom a neural crest in a manner analogous to the spinal pos
. The development of the sympathetic nervous system in mammals. the sym-pathetic trunk of an embryo 11 mm. in length, X 125. evidence of the migration of medullary cells from the neural tubeis found in embryos about 4.5 mm. in length. At this stage theneural crest is not yet differentiated into ganglia, but appears asan inconspicuous ridge spreading laterally from the median dorsalline of the neural tube. It is so inconspicuous indeed that inmany sections it may be distinguished only under favorable con-ditions. In a few instances the fibers of the ventral nerve-rootshave penetrated the walls Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-sympathetic-nervous-system-in-mammals-the-sym-pathetic-trunk-of-an-embryo-11-mm-in-length-x-125-evidence-of-the-migration-of-medullary-cells-from-the-neural-tubeis-found-in-embryos-about-45-mm-in-length-at-this-stage-theneural-crest-is-not-yet-differentiated-into-ganglia-but-appears-asan-inconspicuous-ridge-spreading-laterally-from-the-median-dorsalline-of-the-neural-tube-it-is-so-inconspicuous-indeed-that-inmany-sections-it-may-be-distinguished-only-under-favorable-con-ditions-in-a-few-instances-the-fibers-of-the-ventral-nerve-rootshave-penetrated-the-walls-image370347462.htmlRM2CEENY2–. The development of the sympathetic nervous system in mammals. the sym-pathetic trunk of an embryo 11 mm. in length, X 125. evidence of the migration of medullary cells from the neural tubeis found in embryos about 4.5 mm. in length. At this stage theneural crest is not yet differentiated into ganglia, but appears asan inconspicuous ridge spreading laterally from the median dorsalline of the neural tube. It is so inconspicuous indeed that inmany sections it may be distinguished only under favorable con-ditions. In a few instances the fibers of the ventral nerve-rootshave penetrated the walls
. Embryology. Embryology; Embryology; genealogy. VISCERAL GANGLION NEURAL CREST SYMPATHETIC GANGLIA CORTEX OF ADRENAL DORSAL ROOT SPINAL GANGLION SHEATH CELLS. COMMISSURE SYMPATHETIC GANGLION and form the deep-lying ganglia of the viscera. Other cells migrate to the region of the Wolffian duct, where they fuse with mesoderm cells to form the adrenal gland. Still other cells migrate to a region near the spinal cord and develop into the sympathetic ganglia. Another group of neural-crest cells migrates to the limb and enters the feather germs of the skin. This migration has been demonstrated clea Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/embryology-embryology-embryology-genealogy-visceral-ganglion-neural-crest-sympathetic-ganglia-cortex-of-adrenal-dorsal-root-spinal-ganglion-sheath-cells-commissure-sympathetic-ganglion-and-form-the-deep-lying-ganglia-of-the-viscera-other-cells-migrate-to-the-region-of-the-wolffian-duct-where-they-fuse-with-mesoderm-cells-to-form-the-adrenal-gland-still-other-cells-migrate-to-a-region-near-the-spinal-cord-and-develop-into-the-sympathetic-ganglia-another-group-of-neural-crest-cells-migrates-to-the-limb-and-enters-the-feather-germs-of-the-skin-this-migration-has-been-demonstrated-clea-image231282286.htmlRMRC7PWJ–. Embryology. Embryology; Embryology; genealogy. VISCERAL GANGLION NEURAL CREST SYMPATHETIC GANGLIA CORTEX OF ADRENAL DORSAL ROOT SPINAL GANGLION SHEATH CELLS. COMMISSURE SYMPATHETIC GANGLION and form the deep-lying ganglia of the viscera. Other cells migrate to the region of the Wolffian duct, where they fuse with mesoderm cells to form the adrenal gland. Still other cells migrate to a region near the spinal cord and develop into the sympathetic ganglia. Another group of neural-crest cells migrates to the limb and enters the feather germs of the skin. This migration has been demonstrated clea
. The elements of experimental embryology. Embryology, Experimental; Embryology. AMPHIBIAN NERVOUS SYSTEM 395 characteristics in the cells of visceral arch cartilage, and to have traced them back to the neural crest cells^ (figs. 190, 191). Experiments in which the neural crest cells were stained intra vitam have not yet demonstrated the presence of the stain actually l.CBR.. Fig. 191 Chondrocranium of a larva of Rana palustris from which the neural crest was removed on the right-hand side; note reduction of trabecula and visceral arches. Letters as in fig. 190. Also: IR. infra-rostral; PO. pt Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-elements-of-experimental-embryology-embryology-experimental-embryology-amphibian-nervous-system-395-characteristics-in-the-cells-of-visceral-arch-cartilage-and-to-have-traced-them-back-to-the-neural-crest-cells-figs-190-191-experiments-in-which-the-neural-crest-cells-were-stained-intra-vitam-have-not-yet-demonstrated-the-presence-of-the-stain-actually-lcbr-fig-191-chondrocranium-of-a-larva-of-rana-palustris-from-which-the-neural-crest-was-removed-on-the-right-hand-side-note-reduction-of-trabecula-and-visceral-arches-letters-as-in-fig-190-also-ir-infra-rostral-po-pt-image231559104.htmlRMRCMC00–. The elements of experimental embryology. Embryology, Experimental; Embryology. AMPHIBIAN NERVOUS SYSTEM 395 characteristics in the cells of visceral arch cartilage, and to have traced them back to the neural crest cells^ (figs. 190, 191). Experiments in which the neural crest cells were stained intra vitam have not yet demonstrated the presence of the stain actually l.CBR.. Fig. 191 Chondrocranium of a larva of Rana palustris from which the neural crest was removed on the right-hand side; note reduction of trabecula and visceral arches. Letters as in fig. 190. Also: IR. infra-rostral; PO. pt
. Embryology. Embryology; Embryology; genealogy. 160 EMBRYOLOGY V, NEURAL FOLDS NOTOCHORD NEURAL PLATE CENTRAL CANAL •NEURAL CREST B Fig. 94. The formation and de- velopment of the neural tube. In A the future spinal cord and spinal ganglia are simply a plate of elon- gated cells. This plate folds to form a tube, as in B. When the folds fuse a strip of tissue is pinched off on either side and this tissue is called the neural crest. In C the neural tube is shown with a central canal, while the neural-crest cells migrate to form the sympathetic ganglia and also the deeper lying visceral ganglia. Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/embryology-embryology-embryology-genealogy-160-embryology-v-neural-folds-notochord-neural-plate-central-canal-neural-crest-b-fig-94-the-formation-and-de-velopment-of-the-neural-tube-in-a-the-future-spinal-cord-and-spinal-ganglia-are-simply-a-plate-of-elon-gated-cells-this-plate-folds-to-form-a-tube-as-in-b-when-the-folds-fuse-a-strip-of-tissue-is-pinched-off-on-either-side-and-this-tissue-is-called-the-neural-crest-in-c-the-neural-tube-is-shown-with-a-central-canal-while-the-neural-crest-cells-migrate-to-form-the-sympathetic-ganglia-and-also-the-deeper-lying-visceral-ganglia-image231282287.htmlRMRC7PWK–. Embryology. Embryology; Embryology; genealogy. 160 EMBRYOLOGY V, NEURAL FOLDS NOTOCHORD NEURAL PLATE CENTRAL CANAL •NEURAL CREST B Fig. 94. The formation and de- velopment of the neural tube. In A the future spinal cord and spinal ganglia are simply a plate of elon- gated cells. This plate folds to form a tube, as in B. When the folds fuse a strip of tissue is pinched off on either side and this tissue is called the neural crest. In C the neural tube is shown with a central canal, while the neural-crest cells migrate to form the sympathetic ganglia and also the deeper lying visceral ganglia.
![. Anatomy, descriptive and applied. Anatomy. THE SPINAL COBD AND BRAIN 807 movement. Tlarrison's demonstration' is of great significance in connection with the "retraction theory" and oll.cr ideas related to the neurone doctrine. 2. In the Neural Crest Tissues.—The nerve tissue elements of the sympathetic system and of the ganglia of the cranial nerves and dorsal roots of the s]>inal nerves are derived from the neural crest. Omitting, for the present, the development of the sympathetic system, it is found that the cells of the paired masses which eventually become the cerebrospina Stock Photo](https://c8.alamy.com/comp/RN5WPB/anatomy-descriptive-and-applied-anatomy-the-spinal-cobd-and-brain-807-movement-tlarrisons-demonstration-is-of-great-significance-in-connection-with-the-quotretraction-theoryquot-and-ollcr-ideas-related-to-the-neurone-doctrine-2-in-the-neural-crest-tissuesthe-nerve-tissue-elements-of-the-sympathetic-system-and-of-the-ganglia-of-the-cranial-nerves-and-dorsal-roots-of-the-s-gtinal-nerves-are-derived-from-the-neural-crest-omitting-for-the-present-the-development-of-the-sympathetic-system-it-is-found-that-the-cells-of-the-paired-masses-which-eventually-become-the-cerebrospina-RN5WPB.jpg ". Anatomy, descriptive and applied. Anatomy. THE SPINAL COBD AND BRAIN 807 movement. Tlarrison's demonstration' is of great significance in connection with the "retraction theory" and oll.cr ideas related to the neurone doctrine. 2. In the Neural Crest Tissues.—The nerve tissue elements of the sympathetic system and of the ganglia of the cranial nerves and dorsal roots of the s]>inal nerves are derived from the neural crest. Omitting, for the present, the development of the sympathetic system, it is found that the cells of the paired masses which eventually become the cerebrospina Stock Photo")
. Anatomy, descriptive and applied. Anatomy. THE SPINAL COBD AND BRAIN 807 movement. Tlarrison's demonstration' is of great significance in connection with the "retraction theory" and oll.cr ideas related to the neurone doctrine. 2. In the Neural Crest Tissues.—The nerve tissue elements of the sympathetic system and of the ganglia of the cranial nerves and dorsal roots of the s]>inal nerves are derived from the neural crest. Omitting, for the present, the development of the sympathetic system, it is found that the cells of the paired masses which eventually become the cerebrospina Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/anatomy-descriptive-and-applied-anatomy-the-spinal-cobd-and-brain-807-movement-tlarrisons-demonstration-is-of-great-significance-in-connection-with-the-quotretraction-theoryquot-and-ollcr-ideas-related-to-the-neurone-doctrine-2-in-the-neural-crest-tissuesthe-nerve-tissue-elements-of-the-sympathetic-system-and-of-the-ganglia-of-the-cranial-nerves-and-dorsal-roots-of-the-s-gtinal-nerves-are-derived-from-the-neural-crest-omitting-for-the-present-the-development-of-the-sympathetic-system-it-is-found-that-the-cells-of-the-paired-masses-which-eventually-become-the-cerebrospina-image236772547.htmlRMRN5WPB–. Anatomy, descriptive and applied. Anatomy. THE SPINAL COBD AND BRAIN 807 movement. Tlarrison's demonstration' is of great significance in connection with the "retraction theory" and oll.cr ideas related to the neurone doctrine. 2. In the Neural Crest Tissues.—The nerve tissue elements of the sympathetic system and of the ganglia of the cranial nerves and dorsal roots of the s]>inal nerves are derived from the neural crest. Omitting, for the present, the development of the sympathetic system, it is found that the cells of the paired masses which eventually become the cerebrospina
. Comparative anatomy. Anatomy, Comparative. r5o COMPARATIVE ANATOMY glossopharyngeal and vagus nerves are mixed, like the trigeminal, and have a similar double origin. Their sensory elements come from the neural crest and skin, while their motor fibers arise as processes (neurites) of motor cells located in the lateral wall of the medulla. One peculiarity of the V, VII, IX and X nerves is that their ganglia receive cellular increments from the skin just above the visceral pouch with which the nerve is associated. The patches of thickened ectoderm which proliferate these cells are known as epi Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/comparative-anatomy-anatomy-comparative-r5o-comparative-anatomy-glossopharyngeal-and-vagus-nerves-are-mixed-like-the-trigeminal-and-have-a-similar-double-origin-their-sensory-elements-come-from-the-neural-crest-and-skin-while-their-motor-fibers-arise-as-processes-neurites-of-motor-cells-located-in-the-lateral-wall-of-the-medulla-one-peculiarity-of-the-v-vii-ix-and-x-nerves-is-that-their-ganglia-receive-cellular-increments-from-the-skin-just-above-the-visceral-pouch-with-which-the-nerve-is-associated-the-patches-of-thickened-ectoderm-which-proliferate-these-cells-are-known-as-epi-image232674964.htmlRMREF784–. Comparative anatomy. Anatomy, Comparative. r5o COMPARATIVE ANATOMY glossopharyngeal and vagus nerves are mixed, like the trigeminal, and have a similar double origin. Their sensory elements come from the neural crest and skin, while their motor fibers arise as processes (neurites) of motor cells located in the lateral wall of the medulla. One peculiarity of the V, VII, IX and X nerves is that their ganglia receive cellular increments from the skin just above the visceral pouch with which the nerve is associated. The patches of thickened ectoderm which proliferate these cells are known as epi
. Anatomischer Anzeiger. Anatomy, Comparative. 53 ween the stages represented in figs. 1 and 2 respectively the cells of the neural crest are increased in number by division, and the mesecto- derm of which they form part has also been increased by the addition of cells further proliferated from the ectoderm, not promiscuously, as seems to be the case in the bird, but in specialized regions and de- finite order of succession. These united cells continue their downward migration until, at the time when four pockets from the alimentary canal have fused with the ectoderm, prior to the formation of Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/anatomischer-anzeiger-anatomy-comparative-53-ween-the-stages-represented-in-figs-1-and-2-respectively-the-cells-of-the-neural-crest-are-increased-in-number-by-division-and-the-mesecto-derm-of-which-they-form-part-has-also-been-increased-by-the-addition-of-cells-further-proliferated-from-the-ectoderm-not-promiscuously-as-seems-to-be-the-case-in-the-bird-but-in-specialized-regions-and-de-finite-order-of-succession-these-united-cells-continue-their-downward-migration-until-at-the-time-when-four-pockets-from-the-alimentary-canal-have-fused-with-the-ectoderm-prior-to-the-formation-of-image236818730.htmlRMRN80KP–. Anatomischer Anzeiger. Anatomy, Comparative. 53 ween the stages represented in figs. 1 and 2 respectively the cells of the neural crest are increased in number by division, and the mesecto- derm of which they form part has also been increased by the addition of cells further proliferated from the ectoderm, not promiscuously, as seems to be the case in the bird, but in specialized regions and de- finite order of succession. These united cells continue their downward migration until, at the time when four pockets from the alimentary canal have fused with the ectoderm, prior to the formation of
. Anatomy, descriptive and applied. Anatomy. Fig. 577.—Diagrams showing development of neural tube and crest. ate by mitosis, and accumulate in paired masses, corresponding in number to the segments of the body, to become, in part at least, the cerebrospinal ganglion cells of the afferent system, while other similarly paired masses migrate farther ventrad to a prevertebral position to form the gangliated cord and widely spread plexuses of the sympathetic system. From the tissues of the wall of the neural NEURAL TU ENTRAL ROOT MOTOCHOR. MESONEPHROS MESENTERY Fig. 578.—Diagram showing developmen Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/anatomy-descriptive-and-applied-anatomy-fig-577diagrams-showing-development-of-neural-tube-and-crest-ate-by-mitosis-and-accumulate-in-paired-masses-corresponding-in-number-to-the-segments-of-the-body-to-become-in-part-at-least-the-cerebrospinal-ganglion-cells-of-the-afferent-system-while-other-similarly-paired-masses-migrate-farther-ventrad-to-a-prevertebral-position-to-form-the-gangliated-cord-and-widely-spread-plexuses-of-the-sympathetic-system-from-the-tissues-of-the-wall-of-the-neural-neural-tu-entral-root-motochor-mesonephros-mesentery-fig-578diagram-showing-developmen-image236772570.htmlRMRN5WR6–. Anatomy, descriptive and applied. Anatomy. Fig. 577.—Diagrams showing development of neural tube and crest. ate by mitosis, and accumulate in paired masses, corresponding in number to the segments of the body, to become, in part at least, the cerebrospinal ganglion cells of the afferent system, while other similarly paired masses migrate farther ventrad to a prevertebral position to form the gangliated cord and widely spread plexuses of the sympathetic system. From the tissues of the wall of the neural NEURAL TU ENTRAL ROOT MOTOCHOR. MESONEPHROS MESENTERY Fig. 578.—Diagram showing developmen
. Anatomy, descriptive and applied. Anatomy. 1002 THE NEB VE SYSTEM Its (apparent) superficial origin is hy three or four filaments, closely connected, from the upper part of the medulla oblongata, in the dorsolateral groove (Fig. 748). The central connections are described on page 880. The small motor component arises from cells in the nucleus ambiguus. The real origin of the sensor fibres of the glossopharyngeal must be looked for in the jugular and petrosal ganglia which are developed from the neural crest. From its superficial origin it passes outward across the flocculus, and leaves the s Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/anatomy-descriptive-and-applied-anatomy-1002-the-neb-ve-system-its-apparent-superficial-origin-is-hy-three-or-four-filaments-closely-connected-from-the-upper-part-of-the-medulla-oblongata-in-the-dorsolateral-groove-fig-748-the-central-connections-are-described-on-page-880-the-small-motor-component-arises-from-cells-in-the-nucleus-ambiguus-the-real-origin-of-the-sensor-fibres-of-the-glossopharyngeal-must-be-looked-for-in-the-jugular-and-petrosal-ganglia-which-are-developed-from-the-neural-crest-from-its-superficial-origin-it-passes-outward-across-the-flocculus-and-leaves-the-s-image236770235.htmlRMRN5PRR–. Anatomy, descriptive and applied. Anatomy. 1002 THE NEB VE SYSTEM Its (apparent) superficial origin is hy three or four filaments, closely connected, from the upper part of the medulla oblongata, in the dorsolateral groove (Fig. 748). The central connections are described on page 880. The small motor component arises from cells in the nucleus ambiguus. The real origin of the sensor fibres of the glossopharyngeal must be looked for in the jugular and petrosal ganglia which are developed from the neural crest. From its superficial origin it passes outward across the flocculus, and leaves the s
. Chordate anatomy. Chordata; Anatomy, Comparative. 390 CHORDATE ANATOMY From each of these cells protoplasmic processes extend in two directions— one towards the central nervous system and one towards the periphery. The olfactory nerve is peculiar in its derivation from cells in the olfactory pit which extend their neurites towards the brain and hence are unipolar. The neural crest is formed of cells left between the neural tube and the skin when the neural tube separates from the skin. The crest, which is primarily continuous, becomes secondarily broken up into the series of cranial and spin Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/chordate-anatomy-chordata-anatomy-comparative-390-chordate-anatomy-from-each-of-these-cells-protoplasmic-processes-extend-in-two-directions-one-towards-the-central-nervous-system-and-one-towards-the-periphery-the-olfactory-nerve-is-peculiar-in-its-derivation-from-cells-in-the-olfactory-pit-which-extend-their-neurites-towards-the-brain-and-hence-are-unipolar-the-neural-crest-is-formed-of-cells-left-between-the-neural-tube-and-the-skin-when-the-neural-tube-separates-from-the-skin-the-crest-which-is-primarily-continuous-becomes-secondarily-broken-up-into-the-series-of-cranial-and-spin-image234923751.htmlRMRJ5KHY–. Chordate anatomy. Chordata; Anatomy, Comparative. 390 CHORDATE ANATOMY From each of these cells protoplasmic processes extend in two directions— one towards the central nervous system and one towards the periphery. The olfactory nerve is peculiar in its derivation from cells in the olfactory pit which extend their neurites towards the brain and hence are unipolar. The neural crest is formed of cells left between the neural tube and the skin when the neural tube separates from the skin. The crest, which is primarily continuous, becomes secondarily broken up into the series of cranial and spin
. A laboratory manual and text-book of embryology. Embryology. 3i4 HISTOGENESIS to a position between the neural tube and myotomes. In this position the ganglion crest forms a band of cells extending the whole length of the spinal cord and as far cranially as the otic vesicles. At regular intervals in its course along the spinal cord the proliferating cells of the crest give rise to enlargements, the spinal ganglia (Fig. 340). The spinal ganglia are segmentally arranged and con- nected at first by bridges of cells which later disappear. In the hind-brain region certain ganglia of the cerebral Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/a-laboratory-manual-and-text-book-of-embryology-embryology-3i4-histogenesis-to-a-position-between-the-neural-tube-and-myotomes-in-this-position-the-ganglion-crest-forms-a-band-of-cells-extending-the-whole-length-of-the-spinal-cord-and-as-far-cranially-as-the-otic-vesicles-at-regular-intervals-in-its-course-along-the-spinal-cord-the-proliferating-cells-of-the-crest-give-rise-to-enlargements-the-spinal-ganglia-fig-340-the-spinal-ganglia-are-segmentally-arranged-and-con-nected-at-first-by-bridges-of-cells-which-later-disappear-in-the-hind-brain-region-certain-ganglia-of-the-cerebral-image232344425.htmlRMRE05K5–. A laboratory manual and text-book of embryology. Embryology. 3i4 HISTOGENESIS to a position between the neural tube and myotomes. In this position the ganglion crest forms a band of cells extending the whole length of the spinal cord and as far cranially as the otic vesicles. At regular intervals in its course along the spinal cord the proliferating cells of the crest give rise to enlargements, the spinal ganglia (Fig. 340). The spinal ganglia are segmentally arranged and con- nected at first by bridges of cells which later disappear. In the hind-brain region certain ganglia of the cerebral
. Text book of vertebrate zoology. Vertebrates; Anatomy, Comparative. NERVOUS SYSTEM. 47. Fig. 48. Diagram of embryonic spinal cord with neural crest, C. central nervous system, they are often spoken of as afferent roots, while for analogous reasons the ventral roots are termed efferent.^ These roots differ also in their mode of development. Cer- tain features of the origin of the dorsal root are still in dispute, but the following statements are pretty generally accepted. At the time of closure of the neural tube a thin sheet of cells is visible on either side of the line of closure between t Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/text-book-of-vertebrate-zoology-vertebrates-anatomy-comparative-nervous-system-47-fig-48-diagram-of-embryonic-spinal-cord-with-neural-crest-c-central-nervous-system-they-are-often-spoken-of-as-afferent-roots-while-for-analogous-reasons-the-ventral-roots-are-termed-efferent-these-roots-differ-also-in-their-mode-of-development-cer-tain-features-of-the-origin-of-the-dorsal-root-are-still-in-dispute-but-the-following-statements-are-pretty-generally-accepted-at-the-time-of-closure-of-the-neural-tube-a-thin-sheet-of-cells-is-visible-on-either-side-of-the-line-of-closure-between-t-image232253067.htmlRMRDT14B–. Text book of vertebrate zoology. Vertebrates; Anatomy, Comparative. NERVOUS SYSTEM. 47. Fig. 48. Diagram of embryonic spinal cord with neural crest, C. central nervous system, they are often spoken of as afferent roots, while for analogous reasons the ventral roots are termed efferent.^ These roots differ also in their mode of development. Cer- tain features of the origin of the dorsal root are still in dispute, but the following statements are pretty generally accepted. At the time of closure of the neural tube a thin sheet of cells is visible on either side of the line of closure between t
. Cunningham's Text-book of anatomy. Anatomy. Roof-plate Surface ectoderm Spinal ganglion (2) Sympathetic ganglion Chromaffin c^lls. Ependyma cells Posterior nerve Posterior nerve-root Anterior nerve-root Sympathetic ganglion Chromaffin cells Basal lamina with neuroblasts (3) Gut Anterior nerve-root Sympathetic ganglion - Chromaffin cells Roots of sympathetic ganglion Sympathetic nerve Secondary sympathetic ganglion Fig. 44.—-Diagrams illustrating the formation of (1) the rudiments of the primitive ganglion from the neural crest. (2) The differentiation of different parts of the primitive ga Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/cunninghams-text-book-of-anatomy-anatomy-roof-plate-surface-ectoderm-spinal-ganglion-2-sympathetic-ganglion-chromaffin-clls-ependyma-cells-posterior-nerve-posterior-nerve-root-anterior-nerve-root-sympathetic-ganglion-chromaffin-cells-basal-lamina-with-neuroblasts-3-gut-anterior-nerve-root-sympathetic-ganglion-chromaffin-cells-roots-of-sympathetic-ganglion-sympathetic-nerve-secondary-sympathetic-ganglion-fig-44-diagrams-illustrating-the-formation-of-1-the-rudiments-of-the-primitive-ganglion-from-the-neural-crest-2-the-differentiation-of-different-parts-of-the-primitive-ga-image231872104.htmlRMRD6K6G–. Cunningham's Text-book of anatomy. Anatomy. Roof-plate Surface ectoderm Spinal ganglion (2) Sympathetic ganglion Chromaffin c^lls. Ependyma cells Posterior nerve Posterior nerve-root Anterior nerve-root Sympathetic ganglion Chromaffin cells Basal lamina with neuroblasts (3) Gut Anterior nerve-root Sympathetic ganglion - Chromaffin cells Roots of sympathetic ganglion Sympathetic nerve Secondary sympathetic ganglion Fig. 44.—-Diagrams illustrating the formation of (1) the rudiments of the primitive ganglion from the neural crest. (2) The differentiation of different parts of the primitive ga
![. Cunningham's Text-book of anatomy. Anatomy. âMesoderm of amnion â â âEctoderm of amnion - Neural crest Roof-plate Lateral wall of neural groove Floor-plate Mesoderm of^*" entoderm vesicle Entoderm' Cavity of entoderm vesicle Amnion cavity. Notochord Mesoderm of chorion Trophoblast of chorion Pig. 41. A. Transverse section of a zygote, showing the constituent parts. B. Diagram of embryonic area showing parts of neural plate and primitive streak. The apical portion of the hollow mesodermal somite is its scleratogenous segment. The cells of the scleratogenous section of the somite undergo Stock Photo](https://c8.alamy.com/comp/RD6K7N/cunninghams-text-book-of-anatomy-anatomy-mesoderm-of-amnion-ectoderm-of-amnion-neural-crest-roof-plate-lateral-wall-of-neural-groove-floor-plate-mesoderm-ofquot-entoderm-vesicle-entoderm-cavity-of-entoderm-vesicle-amnion-cavity-notochord-mesoderm-of-chorion-trophoblast-of-chorion-pig-41-a-transverse-section-of-a-zygote-showing-the-constituent-parts-b-diagram-of-embryonic-area-showing-parts-of-neural-plate-and-primitive-streak-the-apical-portion-of-the-hollow-mesodermal-somite-is-its-scleratogenous-segment-the-cells-of-the-scleratogenous-section-of-the-somite-undergo-RD6K7N.jpg ". Cunningham's Text-book of anatomy. Anatomy. âMesoderm of amnion â â âEctoderm of amnion - Neural crest Roof-plate Lateral wall of neural groove Floor-plate Mesoderm of^*" entoderm vesicle Entoderm' Cavity of entoderm vesicle Amnion cavity. Notochord Mesoderm of chorion Trophoblast of chorion Pig. 41. A. Transverse section of a zygote, showing the constituent parts. B. Diagram of embryonic area showing parts of neural plate and primitive streak. The apical portion of the hollow mesodermal somite is its scleratogenous segment. The cells of the scleratogenous section of the somite undergo Stock Photo")
. Cunningham's Text-book of anatomy. Anatomy. âMesoderm of amnion â â âEctoderm of amnion - Neural crest Roof-plate Lateral wall of neural groove Floor-plate Mesoderm of^*" entoderm vesicle Entoderm' Cavity of entoderm vesicle Amnion cavity. Notochord Mesoderm of chorion Trophoblast of chorion Pig. 41. A. Transverse section of a zygote, showing the constituent parts. B. Diagram of embryonic area showing parts of neural plate and primitive streak. The apical portion of the hollow mesodermal somite is its scleratogenous segment. The cells of the scleratogenous section of the somite undergo Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/cunninghams-text-book-of-anatomy-anatomy-mesoderm-of-amnion-ectoderm-of-amnion-neural-crest-roof-plate-lateral-wall-of-neural-groove-floor-plate-mesoderm-ofquot-entoderm-vesicle-entoderm-cavity-of-entoderm-vesicle-amnion-cavity-notochord-mesoderm-of-chorion-trophoblast-of-chorion-pig-41-a-transverse-section-of-a-zygote-showing-the-constituent-parts-b-diagram-of-embryonic-area-showing-parts-of-neural-plate-and-primitive-streak-the-apical-portion-of-the-hollow-mesodermal-somite-is-its-scleratogenous-segment-the-cells-of-the-scleratogenous-section-of-the-somite-undergo-image231872137.htmlRMRD6K7N–. Cunningham's Text-book of anatomy. Anatomy. âMesoderm of amnion â â âEctoderm of amnion - Neural crest Roof-plate Lateral wall of neural groove Floor-plate Mesoderm of^*" entoderm vesicle Entoderm' Cavity of entoderm vesicle Amnion cavity. Notochord Mesoderm of chorion Trophoblast of chorion Pig. 41. A. Transverse section of a zygote, showing the constituent parts. B. Diagram of embryonic area showing parts of neural plate and primitive streak. The apical portion of the hollow mesodermal somite is its scleratogenous segment. The cells of the scleratogenous section of the somite undergo
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 136 HARVEY EUGENE LEHMAN development. The value of using this particular chimeric-crest combination is ap- parent from the fact that in vivo none, or at best very few, of the T. torosus pro- pigment cells would have differentiated before the 18-20 mm. larval stage (Leh- man, 1950). The chimeric-crest embryos which provided neural crest for this experiment were prepared in the usual manner. After the orthotopically grafted A. ine.vicanuin trunk neural fold had healed in place and neurulation was complete, the dorsal epidermis Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-biological-bulletin-biology-zoology-biology-marine-biology-136-harvey-eugene-lehman-development-the-value-of-using-this-particular-chimeric-crest-combination-is-ap-parent-from-the-fact-that-in-vivo-none-or-at-best-very-few-of-the-t-torosus-pro-pigment-cells-would-have-differentiated-before-the-18-20-mm-larval-stage-leh-man-1950-the-chimeric-crest-embryos-which-provided-neural-crest-for-this-experiment-were-prepared-in-the-usual-manner-after-the-orthotopically-grafted-a-inevicanuin-trunk-neural-fold-had-healed-in-place-and-neurulation-was-complete-the-dorsal-epidermis-image234667957.htmlRMRHP1AD–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 136 HARVEY EUGENE LEHMAN development. The value of using this particular chimeric-crest combination is ap- parent from the fact that in vivo none, or at best very few, of the T. torosus pro- pigment cells would have differentiated before the 18-20 mm. larval stage (Leh- man, 1950). The chimeric-crest embryos which provided neural crest for this experiment were prepared in the usual manner. After the orthotopically grafted A. ine.vicanuin trunk neural fold had healed in place and neurulation was complete, the dorsal epidermis
![. Comparative anatomy. Anatomy, Comparative. neural primordium crest of dorsal. Fig. 460.—Drawing showing closure of the neural tube and formation of the neural crest. From pig embryos of:—A, 8 somites; B, 10 somites; C, 11 somites; D, 13 somites. X135. (From Patten's "Embryology of the Pig.") Visceral motor fibers develop in a manner similar to that of somatic motor fibers, except that the nerve cells are located in the lateral column dorsal to the somatic motor column. Both the nerve cell in the neural tube and the peripheral fiber from it are relatively small and the myelin thin. Stock Photo](https://c8.alamy.com/comp/REF78N/comparative-anatomy-anatomy-comparative-neural-primordium-crest-of-dorsal-fig-460drawing-showing-closure-of-the-neural-tube-and-formation-of-the-neural-crest-from-pig-embryos-ofa-8-somites-b-10-somites-c-11-somites-d-13-somites-x135-from-pattens-quotembryology-of-the-pigquot-visceral-motor-fibers-develop-in-a-manner-similar-to-that-of-somatic-motor-fibers-except-that-the-nerve-cells-are-located-in-the-lateral-column-dorsal-to-the-somatic-motor-column-both-the-nerve-cell-in-the-neural-tube-and-the-peripheral-fiber-from-it-are-relatively-small-and-the-myelin-thin-REF78N.jpg ". Comparative anatomy. Anatomy, Comparative. neural primordium crest of dorsal. Fig. 460.—Drawing showing closure of the neural tube and formation of the neural crest. From pig embryos of:—A, 8 somites; B, 10 somites; C, 11 somites; D, 13 somites. X135. (From Patten's "Embryology of the Pig.") Visceral motor fibers develop in a manner similar to that of somatic motor fibers, except that the nerve cells are located in the lateral column dorsal to the somatic motor column. Both the nerve cell in the neural tube and the peripheral fiber from it are relatively small and the myelin thin. Stock Photo")
. Comparative anatomy. Anatomy, Comparative. neural primordium crest of dorsal. Fig. 460.—Drawing showing closure of the neural tube and formation of the neural crest. From pig embryos of:—A, 8 somites; B, 10 somites; C, 11 somites; D, 13 somites. X135. (From Patten's "Embryology of the Pig.") Visceral motor fibers develop in a manner similar to that of somatic motor fibers, except that the nerve cells are located in the lateral column dorsal to the somatic motor column. Both the nerve cell in the neural tube and the peripheral fiber from it are relatively small and the myelin thin. Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/comparative-anatomy-anatomy-comparative-neural-primordium-crest-of-dorsal-fig-460drawing-showing-closure-of-the-neural-tube-and-formation-of-the-neural-crest-from-pig-embryos-ofa-8-somites-b-10-somites-c-11-somites-d-13-somites-x135-from-pattens-quotembryology-of-the-pigquot-visceral-motor-fibers-develop-in-a-manner-similar-to-that-of-somatic-motor-fibers-except-that-the-nerve-cells-are-located-in-the-lateral-column-dorsal-to-the-somatic-motor-column-both-the-nerve-cell-in-the-neural-tube-and-the-peripheral-fiber-from-it-are-relatively-small-and-the-myelin-thin-image232674981.htmlRMREF78N–. Comparative anatomy. Anatomy, Comparative. neural primordium crest of dorsal. Fig. 460.—Drawing showing closure of the neural tube and formation of the neural crest. From pig embryos of:—A, 8 somites; B, 10 somites; C, 11 somites; D, 13 somites. X135. (From Patten's "Embryology of the Pig.") Visceral motor fibers develop in a manner similar to that of somatic motor fibers, except that the nerve cells are located in the lateral column dorsal to the somatic motor column. Both the nerve cell in the neural tube and the peripheral fiber from it are relatively small and the myelin thin.
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIGURE 13. Fiindiilus: cross-section at stage 15. The neural keel is forming. FIGURE 14. Fitndiiliis: cross-section at stage 18. There is a well developed neural keel with loosening of the crest cells. FIGURE 15. Funditlii.'C cross-section at stage 21. This is a late loose crest stage in the posterior trunk region. FIGURE 16. Fiuidnlits: cross-section at stage 21. The crest is migrating and melanophores are beginning to differentiate in this embryo. There are well developed yolk sac melanophores before this stage. size and s Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-biological-bulletin-biology-zoology-biology-marine-biology-figure-13-fiindiilus-cross-section-at-stage-15-the-neural-keel-is-forming-figure-14-fitndiiliis-cross-section-at-stage-18-there-is-a-well-developed-neural-keel-with-loosening-of-the-crest-cells-figure-15-funditliic-cross-section-at-stage-21-this-is-a-late-loose-crest-stage-in-the-posterior-trunk-region-figure-16-fiuidnlits-cross-section-at-stage-21-the-crest-is-migrating-and-melanophores-are-beginning-to-differentiate-in-this-embryo-there-are-well-developed-yolk-sac-melanophores-before-this-stage-size-and-s-image234664861.htmlRMRHNWBW–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIGURE 13. Fiindiilus: cross-section at stage 15. The neural keel is forming. FIGURE 14. Fitndiiliis: cross-section at stage 18. There is a well developed neural keel with loosening of the crest cells. FIGURE 15. Funditlii.'C cross-section at stage 21. This is a late loose crest stage in the posterior trunk region. FIGURE 16. Fiuidnlits: cross-section at stage 21. The crest is migrating and melanophores are beginning to differentiate in this embryo. There are well developed yolk sac melanophores before this stage. size and s
![. Chordate anatomy. Chordata; Anatomy, Comparative. neural â ^râ ectoderm neural tube. Fig. 343.âDrawing showing closure of the neural tube and formation of the neural crest. From pig embryos of:âA, 8 somites; S, 10 somites; C, 11 somites; D, 13 somites. X135. (From Patten's "Embryology of the Pig.") Development of Motor Nerves. How nerve and muscle become con- nected with one another has been a much discussed problem in biology. According to Hensen and Kerr the connexion is primary and not second- ary. Nerve and muscle are assumed by them to be, like all the other cells of the body, Stock Photo](https://c8.alamy.com/comp/RJ4YR6/chordate-anatomy-chordata-anatomy-comparative-neural-r-ectoderm-neural-tube-fig-343drawing-showing-closure-of-the-neural-tube-and-formation-of-the-neural-crest-from-pig-embryos-ofa-8-somites-s-10-somites-c-11-somites-d-13-somites-x135-from-pattens-quotembryology-of-the-pigquot-development-of-motor-nerves-how-nerve-and-muscle-become-con-nected-with-one-another-has-been-a-much-discussed-problem-in-biology-according-to-hensen-and-kerr-the-connexion-is-primary-and-not-second-ary-nerve-and-muscle-are-assumed-by-them-to-be-like-all-the-other-cells-of-the-body-RJ4YR6.jpg ". Chordate anatomy. Chordata; Anatomy, Comparative. neural â ^râ ectoderm neural tube. Fig. 343.âDrawing showing closure of the neural tube and formation of the neural crest. From pig embryos of:âA, 8 somites; S, 10 somites; C, 11 somites; D, 13 somites. X135. (From Patten's "Embryology of the Pig.") Development of Motor Nerves. How nerve and muscle become con- nected with one another has been a much discussed problem in biology. According to Hensen and Kerr the connexion is primary and not second- ary. Nerve and muscle are assumed by them to be, like all the other cells of the body, Stock Photo")
. Chordate anatomy. Chordata; Anatomy, Comparative. neural â ^râ ectoderm neural tube. Fig. 343.âDrawing showing closure of the neural tube and formation of the neural crest. From pig embryos of:âA, 8 somites; S, 10 somites; C, 11 somites; D, 13 somites. X135. (From Patten's "Embryology of the Pig.") Development of Motor Nerves. How nerve and muscle become con- nected with one another has been a much discussed problem in biology. According to Hensen and Kerr the connexion is primary and not second- ary. Nerve and muscle are assumed by them to be, like all the other cells of the body, Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/chordate-anatomy-chordata-anatomy-comparative-neural-r-ectoderm-neural-tube-fig-343drawing-showing-closure-of-the-neural-tube-and-formation-of-the-neural-crest-from-pig-embryos-ofa-8-somites-s-10-somites-c-11-somites-d-13-somites-x135-from-pattens-quotembryology-of-the-pigquot-development-of-motor-nerves-how-nerve-and-muscle-become-con-nected-with-one-another-has-been-a-much-discussed-problem-in-biology-according-to-hensen-and-kerr-the-connexion-is-primary-and-not-second-ary-nerve-and-muscle-are-assumed-by-them-to-be-like-all-the-other-cells-of-the-body-image234908218.htmlRMRJ4YR6–. Chordate anatomy. Chordata; Anatomy, Comparative. neural â ^râ ectoderm neural tube. Fig. 343.âDrawing showing closure of the neural tube and formation of the neural crest. From pig embryos of:âA, 8 somites; S, 10 somites; C, 11 somites; D, 13 somites. X135. (From Patten's "Embryology of the Pig.") Development of Motor Nerves. How nerve and muscle become con- nected with one another has been a much discussed problem in biology. According to Hensen and Kerr the connexion is primary and not second- ary. Nerve and muscle are assumed by them to be, like all the other cells of the body,
. The chordates. Chordata. 272 Basic Structure of Vertebrates out nerve-fibers which constitute the dorsal sensory root of a spinal nerve. The fibers of the other constituent root of a spinal nerve, the ventral motor root, grow out from cells within the neural tube. Some. Fig. 225. Diagrams illustrating method of origin of the neural tube of verte- brates. Transverse sections in the mid- trunk region of embryos at successively (A-D) later stages, (c) Neural crest; (cc) canalis centralis of neural tube; (ec) ectoderm; (en) endoderm; (mes) mesoderm: (nc) notochord; (ng) neu- ral groove; (np) neu Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-chordates-chordata-272-basic-structure-of-vertebrates-out-nerve-fibers-which-constitute-the-dorsal-sensory-root-of-a-spinal-nerve-the-fibers-of-the-other-constituent-root-of-a-spinal-nerve-the-ventral-motor-root-grow-out-from-cells-within-the-neural-tube-some-fig-225-diagrams-illustrating-method-of-origin-of-the-neural-tube-of-verte-brates-transverse-sections-in-the-mid-trunk-region-of-embryos-at-successively-a-d-later-stages-c-neural-crest-cc-canalis-centralis-of-neural-tube-ec-ectoderm-en-endoderm-mes-mesoderm-nc-notochord-ng-neu-ral-groove-np-neu-image234908980.htmlRMRJ50PC–. The chordates. Chordata. 272 Basic Structure of Vertebrates out nerve-fibers which constitute the dorsal sensory root of a spinal nerve. The fibers of the other constituent root of a spinal nerve, the ventral motor root, grow out from cells within the neural tube. Some. Fig. 225. Diagrams illustrating method of origin of the neural tube of verte- brates. Transverse sections in the mid- trunk region of embryos at successively (A-D) later stages, (c) Neural crest; (cc) canalis centralis of neural tube; (ec) ectoderm; (en) endoderm; (mes) mesoderm: (nc) notochord; (ng) neu- ral groove; (np) neu
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIGURE 1A. A culture in Holtfreter solution of two pieces of neural crest differing moderately in age, showing a primary outgrowth (below) of A. punctatinn chromatophores 11 days after explantation, and a secondary outgrowth (above) of T. torosus pro-pigment cells heavily charged with yolk platelets 5 days after explantation. A broken line marks the ap- proximate boundary between the cells of the two outgrowths. FIGURE 1A'. A different culture from the same ^series as figure 1A, 3 days later. FIGURE IB. A culture of two piec Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-biological-bulletin-biology-zoology-biology-marine-biology-figure-1a-a-culture-in-holtfreter-solution-of-two-pieces-of-neural-crest-differing-moderately-in-age-showing-a-primary-outgrowth-below-of-a-punctatinn-chromatophores-11-days-after-explantation-and-a-secondary-outgrowth-above-of-t-torosus-pro-pigment-cells-heavily-charged-with-yolk-platelets-5-days-after-explantation-a-broken-line-marks-the-ap-proximate-boundary-between-the-cells-of-the-two-outgrowths-figure-1a-a-different-culture-from-the-same-series-as-figure-1a-3-days-later-figure-ib-a-culture-of-two-piec-image234668000.htmlRMRHP1C0–. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIGURE 1A. A culture in Holtfreter solution of two pieces of neural crest differing moderately in age, showing a primary outgrowth (below) of A. punctatinn chromatophores 11 days after explantation, and a secondary outgrowth (above) of T. torosus pro-pigment cells heavily charged with yolk platelets 5 days after explantation. A broken line marks the ap- proximate boundary between the cells of the two outgrowths. FIGURE 1A'. A different culture from the same ^series as figure 1A, 3 days later. FIGURE IB. A culture of two piec
. Anatomischer Anzeiger. Anatomy, Comparative. Fig. 1. aud auditory epithelium, br floor of brain, dl—d2 ant and post, divisions of neural crest, ect ectoderm as it passes over the yolk, opt optic vesicle still widely open to the brain. (Only one layer of cells is represented in the diagrams, where two, three, or even four exists.) Fig. 2. F attachment of Gasserian ganglion, VII attachment of fa- cial ganglion, IX glos- sopharyngeal ganglion forming, Jsome of the vagus cells, aud audi- tory vesicle, br floor of brain, 1 Jj—2 br first and second bran- chial clefts, hy-br hyo- branchial cleft, h Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/anatomischer-anzeiger-anatomy-comparative-fig-1-aud-auditory-epithelium-br-floor-of-brain-dld2-ant-and-post-divisions-of-neural-crest-ect-ectoderm-as-it-passes-over-the-yolk-opt-optic-vesicle-still-widely-open-to-the-brain-only-one-layer-of-cells-is-represented-in-the-diagrams-where-two-three-or-even-four-exists-fig-2-f-attachment-of-gasserian-ganglion-vii-attachment-of-fa-cial-ganglion-ix-glos-sopharyngeal-ganglion-forming-jsome-of-the-vagus-cells-aud-audi-tory-vesicle-br-floor-of-brain-1-jj2-br-first-and-second-bran-chial-clefts-hy-br-hyo-branchial-cleft-h-image236818719.htmlRMRN80KB–. Anatomischer Anzeiger. Anatomy, Comparative. Fig. 1. aud auditory epithelium, br floor of brain, dl—d2 ant and post, divisions of neural crest, ect ectoderm as it passes over the yolk, opt optic vesicle still widely open to the brain. (Only one layer of cells is represented in the diagrams, where two, three, or even four exists.) Fig. 2. F attachment of Gasserian ganglion, VII attachment of fa- cial ganglion, IX glos- sopharyngeal ganglion forming, Jsome of the vagus cells, aud audi- tory vesicle, br floor of brain, 1 Jj—2 br first and second bran- chial clefts, hy-br hyo- branchial cleft, h
. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. FROM TWELVE TO THIRTY-SIX SOMITES 157 appear to form mesenchyme. The formation of mesenchyme from certain parts of the neural crest is most marked in the region of the brain. The primordia of the gangha contain the cells (neuroblasts) which form the dorsal root fibers of the spinal nerves and parts of certain cranial nerves. They also appear to contain the cells from which the sheaths of the nerve fibers are formed; thus three kinds of cells at least are found in the neural crest, viz., mesenchyme Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-chick-an-introduction-to-embryology-embryology-chickens-embryos-from-twelve-to-thirty-six-somites-157-appear-to-form-mesenchyme-the-formation-of-mesenchyme-from-certain-parts-of-the-neural-crest-is-most-marked-in-the-region-of-the-brain-the-primordia-of-the-gangha-contain-the-cells-neuroblasts-which-form-the-dorsal-root-fibers-of-the-spinal-nerves-and-parts-of-certain-cranial-nerves-they-also-appear-to-contain-the-cells-from-which-the-sheaths-of-the-nerve-fibers-are-formed-thus-three-kinds-of-cells-at-least-are-found-in-the-neural-crest-viz-mesenchyme-image231665942.htmlRMRCW87J–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. FROM TWELVE TO THIRTY-SIX SOMITES 157 appear to form mesenchyme. The formation of mesenchyme from certain parts of the neural crest is most marked in the region of the brain. The primordia of the gangha contain the cells (neuroblasts) which form the dorsal root fibers of the spinal nerves and parts of certain cranial nerves. They also appear to contain the cells from which the sheaths of the nerve fibers are formed; thus three kinds of cells at least are found in the neural crest, viz., mesenchyme
. The development of the chick; an introduction to embryology. Birds -- Embryology. FROM TWELVE TO THIRTY-SIX SOMITES 157 appear to form mesenchyme. The formation of mesenchyme from certain parts of the neural crest is most marked in the region of the brain. The primordia of the gangha contain the cells (neuroblasts) which form the dorsal root fibers of the spinal nerves and parts of certain cranial nerves. They also appear to contain the cells from which the sheaths of the nerve fibers are formed; thus three kinds of cells at least are found in the neural crest, viz., mesenchyme forming cells Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-chick-an-introduction-to-embryology-birds-embryology-from-twelve-to-thirty-six-somites-157-appear-to-form-mesenchyme-the-formation-of-mesenchyme-from-certain-parts-of-the-neural-crest-is-most-marked-in-the-region-of-the-brain-the-primordia-of-the-gangha-contain-the-cells-neuroblasts-which-form-the-dorsal-root-fibers-of-the-spinal-nerves-and-parts-of-certain-cranial-nerves-they-also-appear-to-contain-the-cells-from-which-the-sheaths-of-the-nerve-fibers-are-formed-thus-three-kinds-of-cells-at-least-are-found-in-the-neural-crest-viz-mesenchyme-forming-cells-image231629691.htmlRMRCRJ0Y–. The development of the chick; an introduction to embryology. Birds -- Embryology. FROM TWELVE TO THIRTY-SIX SOMITES 157 appear to form mesenchyme. The formation of mesenchyme from certain parts of the neural crest is most marked in the region of the brain. The primordia of the gangha contain the cells (neuroblasts) which form the dorsal root fibers of the spinal nerves and parts of certain cranial nerves. They also appear to contain the cells from which the sheaths of the nerve fibers are formed; thus three kinds of cells at least are found in the neural crest, viz., mesenchyme forming cells
. Embryology. Embryology; Embryology; genealogy. 142 EMBRYOLOGY. Fig. 82. The relationship of the developing limb to the neuroblasts which form the limb nerves. The neuroblasts are shown as small, rounded cells in the neural tube and in the neural crest. A broken line indicates migration of neuroblasts from the neural crest to the region where the sympathetic ganglia will form. The arrows connecting the neural crest with the spinal cord show the path of the developing nerves. Similarly the arrows from the neural crest to the limb indicate the pathway of the limb nerves. What directs or induces Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/embryology-embryology-embryology-genealogy-142-embryology-fig-82-the-relationship-of-the-developing-limb-to-the-neuroblasts-which-form-the-limb-nerves-the-neuroblasts-are-shown-as-small-rounded-cells-in-the-neural-tube-and-in-the-neural-crest-a-broken-line-indicates-migration-of-neuroblasts-from-the-neural-crest-to-the-region-where-the-sympathetic-ganglia-will-form-the-arrows-connecting-the-neural-crest-with-the-spinal-cord-show-the-path-of-the-developing-nerves-similarly-the-arrows-from-the-neural-crest-to-the-limb-indicate-the-pathway-of-the-limb-nerves-what-directs-or-induces-image231249299.htmlRMRC68RF–. Embryology. Embryology; Embryology; genealogy. 142 EMBRYOLOGY. Fig. 82. The relationship of the developing limb to the neuroblasts which form the limb nerves. The neuroblasts are shown as small, rounded cells in the neural tube and in the neural crest. A broken line indicates migration of neuroblasts from the neural crest to the region where the sympathetic ganglia will form. The arrows connecting the neural crest with the spinal cord show the path of the developing nerves. Similarly the arrows from the neural crest to the limb indicate the pathway of the limb nerves. What directs or induces
![. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. K-'-: â :^:^%^. I â,-j*'''"'-3""-- Fig. 92. â Transverse section immediately be- hind the first visceral pouch of a chick embryo of thirteen somites. (After Gorono- witsch.) Note connection of the periaxial cord with the ectoderm of the visceral arch. Ad., Aorta descendens. c. Rounded me- senchyme cells, g. Place where cells derived from neural crest unite with the mesenchyme cells of the periaxial cord, f. Fusion, p. Spin- dle-shaped peripheral mesenchyme cells. the ectoderm in the Stock Photo](https://c8.alamy.com/comp/RCW86T/the-development-of-the-chick-an-introduction-to-embryology-embryology-chickens-embryos-k-i-jquot-3quotquot-fig-92-transverse-section-immediately-be-hind-the-first-visceral-pouch-of-a-chick-embryo-of-thirteen-somites-after-gorono-witsch-note-connection-of-the-periaxial-cord-with-the-ectoderm-of-the-visceral-arch-ad-aorta-descendens-c-rounded-me-senchyme-cells-g-place-where-cells-derived-from-neural-crest-unite-with-the-mesenchyme-cells-of-the-periaxial-cord-f-fusion-p-spin-dle-shaped-peripheral-mesenchyme-cells-the-ectoderm-in-the-RCW86T.jpg ". The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. K-'-: â :^:^%^. I â,-j*'''"'-3""-- Fig. 92. â Transverse section immediately be- hind the first visceral pouch of a chick embryo of thirteen somites. (After Gorono- witsch.) Note connection of the periaxial cord with the ectoderm of the visceral arch. Ad., Aorta descendens. c. Rounded me- senchyme cells, g. Place where cells derived from neural crest unite with the mesenchyme cells of the periaxial cord, f. Fusion, p. Spin- dle-shaped peripheral mesenchyme cells. the ectoderm in the Stock Photo")
. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. K-'-: â :^:^%^. I â,-j*'''"'-3""-- Fig. 92. â Transverse section immediately be- hind the first visceral pouch of a chick embryo of thirteen somites. (After Gorono- witsch.) Note connection of the periaxial cord with the ectoderm of the visceral arch. Ad., Aorta descendens. c. Rounded me- senchyme cells, g. Place where cells derived from neural crest unite with the mesenchyme cells of the periaxial cord, f. Fusion, p. Spin- dle-shaped peripheral mesenchyme cells. the ectoderm in the Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-chick-an-introduction-to-embryology-embryology-chickens-embryos-k-i-jquot-3quotquot-fig-92-transverse-section-immediately-be-hind-the-first-visceral-pouch-of-a-chick-embryo-of-thirteen-somites-after-gorono-witsch-note-connection-of-the-periaxial-cord-with-the-ectoderm-of-the-visceral-arch-ad-aorta-descendens-c-rounded-me-senchyme-cells-g-place-where-cells-derived-from-neural-crest-unite-with-the-mesenchyme-cells-of-the-periaxial-cord-f-fusion-p-spin-dle-shaped-peripheral-mesenchyme-cells-the-ectoderm-in-the-image231665920.htmlRMRCW86T–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. K-'-: â :^:^%^. I â,-j*'''"'-3""-- Fig. 92. â Transverse section immediately be- hind the first visceral pouch of a chick embryo of thirteen somites. (After Gorono- witsch.) Note connection of the periaxial cord with the ectoderm of the visceral arch. Ad., Aorta descendens. c. Rounded me- senchyme cells, g. Place where cells derived from neural crest unite with the mesenchyme cells of the periaxial cord, f. Fusion, p. Spin- dle-shaped peripheral mesenchyme cells. the ectoderm in the
. Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. 220 ELEMENTS OF BIOLOGY ing embryonic development some of the cells of the neural crest migrate ventrally and take up permanent position in the viscera and elsewhere to become the ganglia of the sympathetic system. The most conspicuous sympathetic ganglia form a chain in the dorsal wall of the body, just ventral to the vertebral column. Fibres from these ganglia ramify to the various organs and tissues, estab-. ANT. N£UftOPOffEi NEURAL FOLD â . NEURAL FOLD ^?? IfPr^--^ .4r'-. Please note th Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/elements-of-biology-with-special-reference-to-their-rle-in-the-lives-of-animals-biology-zoology-220-elements-of-biology-ing-embryonic-development-some-of-the-cells-of-the-neural-crest-migrate-ventrally-and-take-up-permanent-position-in-the-viscera-and-elsewhere-to-become-the-ganglia-of-the-sympathetic-system-the-most-conspicuous-sympathetic-ganglia-form-a-chain-in-the-dorsal-wall-of-the-body-just-ventral-to-the-vertebral-column-fibres-from-these-ganglia-ramify-to-the-various-organs-and-tissues-estab-ant-nuftopoffei-neural-fold-neural-fold-ifpr-4r-please-note-th-image231663297.htmlRMRCW4W5–. Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. 220 ELEMENTS OF BIOLOGY ing embryonic development some of the cells of the neural crest migrate ventrally and take up permanent position in the viscera and elsewhere to become the ganglia of the sympathetic system. The most conspicuous sympathetic ganglia form a chain in the dorsal wall of the body, just ventral to the vertebral column. Fibres from these ganglia ramify to the various organs and tissues, estab-. ANT. N£UftOPOffEi NEURAL FOLD â . NEURAL FOLD ^?? IfPr^--^ .4r'-. Please note th
![. The development of the chick; an introduction to embryology. Birds -- Embryology. #5 i^i^'t.f/*"*'-. Fig. 92. — Transverse section immediately be- hind the first visceral pouch of a chick embryo of thirteen somites. (After Gorono- witsch.) Note connection of the periaxial cord with the ectoderm of the visceral arch. Ad., Aorta descendens. c. Rounded me- senchyme cells, g. Place where cells derived from neural crest unite with the mesenchyme cells of the periaxial cord. f. Fusion, p. Spin- dle-shaped peripheral mesenchyme cells. the ectoderm in the neighborhood of the first visceral pouc Stock Photo](https://c8.alamy.com/comp/RCRJ01/the-development-of-the-chick-an-introduction-to-embryology-birds-embryology-5-iitfquot-fig-92-transverse-section-immediately-be-hind-the-first-visceral-pouch-of-a-chick-embryo-of-thirteen-somites-after-gorono-witsch-note-connection-of-the-periaxial-cord-with-the-ectoderm-of-the-visceral-arch-ad-aorta-descendens-c-rounded-me-senchyme-cells-g-place-where-cells-derived-from-neural-crest-unite-with-the-mesenchyme-cells-of-the-periaxial-cord-f-fusion-p-spin-dle-shaped-peripheral-mesenchyme-cells-the-ectoderm-in-the-neighborhood-of-the-first-visceral-pouc-RCRJ01.jpg ". The development of the chick; an introduction to embryology. Birds -- Embryology. #5 i^i^'t.f/*"*'-. Fig. 92. — Transverse section immediately be- hind the first visceral pouch of a chick embryo of thirteen somites. (After Gorono- witsch.) Note connection of the periaxial cord with the ectoderm of the visceral arch. Ad., Aorta descendens. c. Rounded me- senchyme cells, g. Place where cells derived from neural crest unite with the mesenchyme cells of the periaxial cord. f. Fusion, p. Spin- dle-shaped peripheral mesenchyme cells. the ectoderm in the neighborhood of the first visceral pouc Stock Photo")
. The development of the chick; an introduction to embryology. Birds -- Embryology. #5 i^i^'t.f/*"*'-. Fig. 92. — Transverse section immediately be- hind the first visceral pouch of a chick embryo of thirteen somites. (After Gorono- witsch.) Note connection of the periaxial cord with the ectoderm of the visceral arch. Ad., Aorta descendens. c. Rounded me- senchyme cells, g. Place where cells derived from neural crest unite with the mesenchyme cells of the periaxial cord. f. Fusion, p. Spin- dle-shaped peripheral mesenchyme cells. the ectoderm in the neighborhood of the first visceral pouc Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-chick-an-introduction-to-embryology-birds-embryology-5-iitfquot-fig-92-transverse-section-immediately-be-hind-the-first-visceral-pouch-of-a-chick-embryo-of-thirteen-somites-after-gorono-witsch-note-connection-of-the-periaxial-cord-with-the-ectoderm-of-the-visceral-arch-ad-aorta-descendens-c-rounded-me-senchyme-cells-g-place-where-cells-derived-from-neural-crest-unite-with-the-mesenchyme-cells-of-the-periaxial-cord-f-fusion-p-spin-dle-shaped-peripheral-mesenchyme-cells-the-ectoderm-in-the-neighborhood-of-the-first-visceral-pouc-image231629665.htmlRMRCRJ01–. The development of the chick; an introduction to embryology. Birds -- Embryology. #5 i^i^'t.f/*"*'-. Fig. 92. — Transverse section immediately be- hind the first visceral pouch of a chick embryo of thirteen somites. (After Gorono- witsch.) Note connection of the periaxial cord with the ectoderm of the visceral arch. Ad., Aorta descendens. c. Rounded me- senchyme cells, g. Place where cells derived from neural crest unite with the mesenchyme cells of the periaxial cord. f. Fusion, p. Spin- dle-shaped peripheral mesenchyme cells. the ectoderm in the neighborhood of the first visceral pouc
![. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. .sc ^^^ ;'*' â ? yT^/. "^^;'^:^^*^ 6-^:^/ Fig. 57. â Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. P, Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Mes., Splanchnic layer of mesoblast. anterior end rapidly grows forward beyond the anterior end of the fore-gut. The floor of Stock Photo](https://c8.alamy.com/comp/RCRJ2J/the-development-of-the-chick-an-introduction-to-embryology-embryology-chickens-embryos-sc-yt-quot-6-fig-57-later-stage-of-the-neural-folds-section-through-the-head-of-an-embryo-of-2-3-s-corresponding-to-about-the-future-mid-brain-region-coel-coelome-g-c-germinal-cells-med-pi-medullary-plate-mes-mesoblast-n-p-neural-fold-n-cr-neural-crest-nch-notochord-som-mes-somatic-layer-of-mesoblast-spl-mes-splanchnic-layer-of-mesoblast-anterior-end-rapidly-grows-forward-beyond-the-anterior-end-of-the-fore-gut-the-floor-of-RCRJ2J.jpg ". The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. .sc ^^^ ;'*' â ? yT^/. "^^;'^:^^*^ 6-^:^/ Fig. 57. â Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. P, Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Mes., Splanchnic layer of mesoblast. anterior end rapidly grows forward beyond the anterior end of the fore-gut. The floor of Stock Photo")
. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. .sc ^^^ ;'*' â ? yT^/. "^^;'^:^^*^ 6-^:^/ Fig. 57. â Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. P, Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Mes., Splanchnic layer of mesoblast. anterior end rapidly grows forward beyond the anterior end of the fore-gut. The floor of Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-chick-an-introduction-to-embryology-embryology-chickens-embryos-sc-yt-quot-6-fig-57-later-stage-of-the-neural-folds-section-through-the-head-of-an-embryo-of-2-3-s-corresponding-to-about-the-future-mid-brain-region-coel-coelome-g-c-germinal-cells-med-pi-medullary-plate-mes-mesoblast-n-p-neural-fold-n-cr-neural-crest-nch-notochord-som-mes-somatic-layer-of-mesoblast-spl-mes-splanchnic-layer-of-mesoblast-anterior-end-rapidly-grows-forward-beyond-the-anterior-end-of-the-fore-gut-the-floor-of-image231629738.htmlRMRCRJ2J–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. .sc ^^^ ;'*' â ? yT^/. "^^;'^:^^*^ 6-^:^/ Fig. 57. â Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. P, Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Mes., Splanchnic layer of mesoblast. anterior end rapidly grows forward beyond the anterior end of the fore-gut. The floor of
![. The development of the chick; an introduction to embryology. Birds -- Embryology. ^^^^^^^ ^cl ^o/r?J/es. O 6^ ^.?>;^: yT^/. 6"ce/ Fig. 57. — Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. F., Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Mes., Splanchnic layer of mesoblast. anterior end rapidly grows forward beyond the anterior end of the fore-gut. The floor of the Stock Photo](https://c8.alamy.com/comp/RCRJC3/the-development-of-the-chick-an-introduction-to-embryology-birds-embryology-cl-orjes-o-6-gt-yt-6quotce-fig-57-later-stage-of-the-neural-folds-section-through-the-head-of-an-embryo-of-2-3-s-corresponding-to-about-the-future-mid-brain-region-coel-coelome-g-c-germinal-cells-med-pi-medullary-plate-mes-mesoblast-n-f-neural-fold-n-cr-neural-crest-nch-notochord-som-mes-somatic-layer-of-mesoblast-spl-mes-splanchnic-layer-of-mesoblast-anterior-end-rapidly-grows-forward-beyond-the-anterior-end-of-the-fore-gut-the-floor-of-the-RCRJC3.jpg ". The development of the chick; an introduction to embryology. Birds -- Embryology. ^^^^^^^ ^cl ^o/r?J/es. O 6^ ^.?>;^: yT^/. 6"ce/ Fig. 57. — Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. F., Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Mes., Splanchnic layer of mesoblast. anterior end rapidly grows forward beyond the anterior end of the fore-gut. The floor of the Stock Photo")
. The development of the chick; an introduction to embryology. Birds -- Embryology. ^^^^^^^ ^cl ^o/r?J/es. O 6^ ^.?>;^: yT^/. 6"ce/ Fig. 57. — Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. F., Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Mes., Splanchnic layer of mesoblast. anterior end rapidly grows forward beyond the anterior end of the fore-gut. The floor of the Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-chick-an-introduction-to-embryology-birds-embryology-cl-orjes-o-6-gt-yt-6quotce-fig-57-later-stage-of-the-neural-folds-section-through-the-head-of-an-embryo-of-2-3-s-corresponding-to-about-the-future-mid-brain-region-coel-coelome-g-c-germinal-cells-med-pi-medullary-plate-mes-mesoblast-n-f-neural-fold-n-cr-neural-crest-nch-notochord-som-mes-somatic-layer-of-mesoblast-spl-mes-splanchnic-layer-of-mesoblast-anterior-end-rapidly-grows-forward-beyond-the-anterior-end-of-the-fore-gut-the-floor-of-the-image231630003.htmlRMRCRJC3–. The development of the chick; an introduction to embryology. Birds -- Embryology. ^^^^^^^ ^cl ^o/r?J/es. O 6^ ^.?>;^: yT^/. 6"ce/ Fig. 57. — Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. F., Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Mes., Splanchnic layer of mesoblast. anterior end rapidly grows forward beyond the anterior end of the fore-gut. The floor of the
![. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. HEAD-FOLD TO TWELVE SOMITES 103 /? Cr /?. /- /? Cr. 26 efi"»:£ee »i^ t^ Coe/.. .sc ^^^ ;'*' â ? yT^/. "^^;'^:^^*^ 6-^:^/ Fig. 57. â Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. P, Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Mes., Splanchnic layer of mesoblast. a Stock Photo](https://c8.alamy.com/comp/RCRJ2M/the-development-of-the-chick-an-introduction-to-embryology-embryology-chickens-embryos-head-fold-to-twelve-somites-103-cr-cr-26-efiquotee-i-t-coe-sc-yt-quot-6-fig-57-later-stage-of-the-neural-folds-section-through-the-head-of-an-embryo-of-2-3-s-corresponding-to-about-the-future-mid-brain-region-coel-coelome-g-c-germinal-cells-med-pi-medullary-plate-mes-mesoblast-n-p-neural-fold-n-cr-neural-crest-nch-notochord-som-mes-somatic-layer-of-mesoblast-spl-mes-splanchnic-layer-of-mesoblast-a-RCRJ2M.jpg ". The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. HEAD-FOLD TO TWELVE SOMITES 103 /? Cr /?. /- /? Cr. 26 efi"»:£ee »i^ t^ Coe/.. .sc ^^^ ;'*' â ? yT^/. "^^;'^:^^*^ 6-^:^/ Fig. 57. â Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. P, Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Mes., Splanchnic layer of mesoblast. a Stock Photo")
. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. HEAD-FOLD TO TWELVE SOMITES 103 /? Cr /?. /- /? Cr. 26 efi"»:£ee »i^ t^ Coe/.. .sc ^^^ ;'*' â ? yT^/. "^^;'^:^^*^ 6-^:^/ Fig. 57. â Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. P, Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Mes., Splanchnic layer of mesoblast. a Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-chick-an-introduction-to-embryology-embryology-chickens-embryos-head-fold-to-twelve-somites-103-cr-cr-26-efiquotee-i-t-coe-sc-yt-quot-6-fig-57-later-stage-of-the-neural-folds-section-through-the-head-of-an-embryo-of-2-3-s-corresponding-to-about-the-future-mid-brain-region-coel-coelome-g-c-germinal-cells-med-pi-medullary-plate-mes-mesoblast-n-p-neural-fold-n-cr-neural-crest-nch-notochord-som-mes-somatic-layer-of-mesoblast-spl-mes-splanchnic-layer-of-mesoblast-a-image231629740.htmlRMRCRJ2M–. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. HEAD-FOLD TO TWELVE SOMITES 103 /? Cr /?. /- /? Cr. 26 efi"»:£ee »i^ t^ Coe/.. .sc ^^^ ;'*' â ? yT^/. "^^;'^:^^*^ 6-^:^/ Fig. 57. â Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. P, Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Mes., Splanchnic layer of mesoblast. a
![. The development of the chick; an introduction to embryology. Birds -- Embryology. HEAD-FOLD TO TWELVE SOMITES 103 /?/='. /?.0 r â gc. med.pl r-l /? Cr. -. f" â¢** «^?s*J«>. ^^^^^^^ ^cl ^o/r?J/es. O 6^ ^.?>;^: yT^/. 6"ce/ Fig. 57. â Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. F., Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Mes., Splanchnic layer of mes Stock Photo](https://c8.alamy.com/comp/RCRJCJ/the-development-of-the-chick-an-introduction-to-embryology-birds-embryology-head-fold-to-twelve-somites-103-=-0-r-gc-medpl-r-l-cr-fquot-sjgt-cl-orjes-o-6-gt-yt-6quotce-fig-57-later-stage-of-the-neural-folds-section-through-the-head-of-an-embryo-of-2-3-s-corresponding-to-about-the-future-mid-brain-region-coel-coelome-g-c-germinal-cells-med-pi-medullary-plate-mes-mesoblast-n-f-neural-fold-n-cr-neural-crest-nch-notochord-som-mes-somatic-layer-of-mesoblast-spl-mes-splanchnic-layer-of-mes-RCRJCJ.jpg ". The development of the chick; an introduction to embryology. Birds -- Embryology. HEAD-FOLD TO TWELVE SOMITES 103 /?/='. /?.0 r â gc. med.pl r-l /? Cr. -. f" â¢** «^?s*J«>. ^^^^^^^ ^cl ^o/r?J/es. O 6^ ^.?>;^: yT^/. 6"ce/ Fig. 57. â Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. F., Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Mes., Splanchnic layer of mes Stock Photo")
. The development of the chick; an introduction to embryology. Birds -- Embryology. HEAD-FOLD TO TWELVE SOMITES 103 /?/='. /?.0 r â gc. med.pl r-l /? Cr. -. f" â¢** «^?s*J«>. ^^^^^^^ ^cl ^o/r?J/es. O 6^ ^.?>;^: yT^/. 6"ce/ Fig. 57. â Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. F., Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Mes., Splanchnic layer of mes Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-development-of-the-chick-an-introduction-to-embryology-birds-embryology-head-fold-to-twelve-somites-103-=-0-r-gc-medpl-r-l-cr-fquot-sjgt-cl-orjes-o-6-gt-yt-6quotce-fig-57-later-stage-of-the-neural-folds-section-through-the-head-of-an-embryo-of-2-3-s-corresponding-to-about-the-future-mid-brain-region-coel-coelome-g-c-germinal-cells-med-pi-medullary-plate-mes-mesoblast-n-f-neural-fold-n-cr-neural-crest-nch-notochord-som-mes-somatic-layer-of-mesoblast-spl-mes-splanchnic-layer-of-mes-image231630018.htmlRMRCRJCJ–. The development of the chick; an introduction to embryology. Birds -- Embryology. HEAD-FOLD TO TWELVE SOMITES 103 /?/='. /?.0 r â gc. med.pl r-l /? Cr. -. f" â¢** «^?s*J«>. ^^^^^^^ ^cl ^o/r?J/es. O 6^ ^.?>;^: yT^/. 6"ce/ Fig. 57. â Later stage of the neural folds. Section through the head of an embryo of 2-3 s; corresponding to about the future mid-brain region. Coel., Coelome. g. C, Germinal cells, med. pi., Medullary plate. Mes., Mesoblast. n. F., Neural fold. n. Cr., Neural crest. N'ch., Notochord. som. Mes., Somatic layer of mesoblast. spl. Mes., Splanchnic layer of mes
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