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Spermatozoa anatomy Stock Photos and Images
RF2H8XD1K–Spermogram. Medical infographic with healthy and damaged spermatozoa birth plan ovulation processes garish vector flat templates
RFM8NJXC–Human ovum, or egg, surrounded by numerous spermatozoa, computer illustration. In fertilisation, only a single sperm may successfully penetrate the ovum to fuse with the female nucleus. Barriers to be overcome include layers of follicular cells surrounding the ovum (corona radiata) and an underlying glycoprotein membrane, the zona pellucida. The membrane is digested by enzymes released from the acrosome, a cap on the head of the sperm: subsequent rapid chemical changes in the zona pellucida prevent competing sperm from entering.
RMW9GJDT–Archive image from page 249 of Bees & bee-keeping; scientific and. Bees & bee-keeping; scientific and practical. A complete treatise on the anatomy, physiology, floral relations, and profitable management of the hive bee CUbiodiversity1154323 Year: 1886 ( 224 BEES AND BEE-KEEPING. larger, furnishing drones, because she possesses the extraordinary faculty of giving at will, or withholding, spermatozoa from the egg about to be deposited. Let us return to the study of her anatomy, for the purpose of unravelling the mystery of the mechanism by which this is accomplished. Fig. 44.—Part of Sperm
RM2AJ1HBM–Lectures on the comparative anatomy and physiology of the invertebrate animals : delivered at the Royal College of Surgeons . ugh the transparent bodies of the polypes. When the larvae haveacquired their ciliated surface and red colour they become detachedfrom the mesogastric folds, and work their way slowly through thepolypes when the bodies of these are expanded and distended withwater. Certain individuals, or groups of individuals, of the Lobulariadigitata have been found to develop only sperm-sacs and spermatozoa. §The fleshy substance of the ActhiicCf Lohularice and Alcyonia isstrengthene
RMPFN5E1–. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Cells of Developement with Spermatozoa of the House Sparrow. regularity, which they subsequently attain. The presence of the spermatozoa can only be proved with certainty, when they have become free, after the dissolution of their formative cells, the mother cyst still continuing to en- circle them. Thus we may also explain the former conjecture of one of us, R. Wagner, who thought that the spermatozoa of the singing birds had their origin immediately in the interior of the large cysts. The spermatozoa of the singing bir
RFM8NJXG–Human ovum, or egg, surrounded by numerous spermatozoa, computer illustration. In fertilisation, only a single sperm may successfully penetrate the ovum to fuse with the female nucleus. Barriers to be overcome include layers of follicular cells surrounding the ovum (corona radiata) and an underlying glycoprotein membrane, the zona pellucida. The membrane is digested by enzymes released from the acrosome, a cap on the head of the sperm: subsequent rapid chemical changes in the zona pellucida prevent competing sperm from entering.
RMW1TTE6–Archive image from page 509 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0401todd Year: 1847 Spermatozoa of an Insect. The spermatozoa of the Hexapods are developed in the same endogenous man- ner, as among the Vertebrata. This process ma}' very easily be observed. The vesicles of developement, which measure pretty uniformly, when in a developed state, -0'' (they are smaller in many Diptera, Culex C''), Musca, Fig. 367.
RF2D8BETB–Human Egg or Ovum structure and Human Sperm or Spermatazoa for health education infographic illustration
RM2AWF6HF–An introduction to the study of the comparative anatomy of animals . yknown as bivalens has four chromosomata in its nuclei, andthis will be chosen for the description of the processes ofmaturation of the germ-cells. Beginning with the sper-matozoon—it must be explained that the spermatozoa of thethread-worms (Nematoidea), of which Ascaris is an example,are not filamentous, like those of most other animals, but aresimply cellular, and therefore are very suitable objects for study.The primitive germ-cells have, like the rest of the tissue-cells ofthe body, four chromosomata each. They multiply
RMPFN5DF–. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Cells of Developement with Spermatozoa of the House Sparrow. regularity, which they subsequently attain. The presence of the spermatozoa can only be proved with certainty, when they have become free, after the dissolution of their formative cells, the mother cyst still continuing to en- circle them. Thus we may also explain the former conjecture of one of us, R. Wagner, who thought that the spermatozoa of the singing birds had their origin immediately in the interior of the large cysts. The spermatozoa of the singing bir
RFM8NJXX–Human ovum, or egg, surrounded by numerous spermatozoa, computer illustration. In fertilisation, only a single sperm may successfully penetrate the ovum to fuse with the female nucleus. Barriers to be overcome include layers of follicular cells surrounding the ovum (corona radiata) and an underlying glycoprotein membrane, the zona pellucida. The membrane is digested by enzymes released from the acrosome, a cap on the head of the sperm: subsequent rapid chemical changes in the zona pellucida prevent competing sperm from entering.
RMW1TWWE–Archive image from page 518 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0401todd Year: 1847 r> Developement of the spermatozoa in Lumbricus. the Helicinae (fg. 387. A,). According to analogy with the higher animals the sperma- tozoa are also unquestionably produced in an endogenous way, and, as is shown by the ob- servations ofIio/li/ier-- on the clevelopement of the spermatozoa in Lumbricus and Distoma, in the interior of the nuclei. We cannot, however, trace the process of formation with decisive certainty owing to the smallness of the elemen
RF2CH0CHP–Human Egg or Ovum structure and Human Sperm or Spermatazoa for health education infographic illustration
RM2AWF4G3–An introduction to the study of the comparative anatomy of animals . yknown as bivalens has four chromosomata in its nuclei, andthis will be chosen for the description of the processes ofmaturation of the germ-cells. Beginning with the sper-matozoon—it must be explained that the spermatozoa of thethread-worms (Nematoidea), of which Ascaris is an example,are not filamentous, like those of most other animals, but aresimply cellular, and therefore are very suitable objects for study.The primitive germ-cells have, like the rest of the tissue-cells ofthe body, four chromosomata each. They multiply
![. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. [120] OVUM. or is rather a collection or aggregation of a number of germs surrounded by a common yolk; in fact, as has been suggested, an ova- rian sac containing a number of ova.* The manner in which the spermatozoa reach the ova for fecundation does not appear to have been ascertained with accuracy. Entozoa.—The ovology of the Helmintha or Entozoa has received considerable atten- tion from physiologists, both on account of the interesting nature of the phenomena pre- sented by its study, and because of the anxiety to d Stock Photo](https://c8.alamy.com/comp/PFM9KB/the-cyclopdia-of-anatomy-and-physiology-anatomy-physiology-zoology-120-ovum-or-is-rather-a-collection-or-aggregation-of-a-number-of-germs-surrounded-by-a-common-yolk-in-fact-as-has-been-suggested-an-ova-rian-sac-containing-a-number-of-ova-the-manner-in-which-the-spermatozoa-reach-the-ova-for-fecundation-does-not-appear-to-have-been-ascertained-with-accuracy-entozoathe-ovology-of-the-helmintha-or-entozoa-has-received-considerable-atten-tion-from-physiologists-both-on-account-of-the-interesting-nature-of-the-phenomena-pre-sented-by-its-study-and-because-of-the-anxiety-to-d-PFM9KB.jpg ". The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. [120] OVUM. or is rather a collection or aggregation of a number of germs surrounded by a common yolk; in fact, as has been suggested, an ova- rian sac containing a number of ova.* The manner in which the spermatozoa reach the ova for fecundation does not appear to have been ascertained with accuracy. Entozoa.—The ovology of the Helmintha or Entozoa has received considerable atten- tion from physiologists, both on account of the interesting nature of the phenomena pre- sented by its study, and because of the anxiety to d Stock Photo")
RMPFM9KB–. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. [120] OVUM. or is rather a collection or aggregation of a number of germs surrounded by a common yolk; in fact, as has been suggested, an ova- rian sac containing a number of ova.* The manner in which the spermatozoa reach the ova for fecundation does not appear to have been ascertained with accuracy. Entozoa.—The ovology of the Helmintha or Entozoa has received considerable atten- tion from physiologists, both on account of the interesting nature of the phenomena pre- sented by its study, and because of the anxiety to d
RFM8NJYG–Human ovum, or egg, surrounded by numerous spermatozoa, computer illustration. In fertilisation, only a single sperm may successfully penetrate the ovum to fuse with the female nucleus. Barriers to be overcome include layers of follicular cells surrounding the ovum (corona radiata) and an underlying glycoprotein membrane, the zona pellucida. The membrane is digested by enzymes released from the acrosome, a cap on the head of the sperm: subsequent rapid chemical changes in the zona pellucida prevent competing sperm from entering.
RMW1TTBW–Archive image from page 508 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0401todd Year: 1847 Spermatozoa of Helix po- A group of Spermatozoa matia at their extrusion of Helix pomatia, from the mother cell. partially protruded from the mother cell. As soon as the heads of the spermatozoa have projected, the remainder of the mother cell lengthens itself, and becomes a delicate cylindrical envelope. These remains still ad- here to the spermatozoa when completely ex- tended, exhibiting the appearance of a couple of larger or smaller knobs on the tail: t
RM2AJ1G3H–Lectures on the comparative anatomy and physiology of the invertebrate animals : delivered at the Royal College of Surgeons . on with the cavity of the body. Dr. Soulby, of Dover, informs methat he distinctly saw a stream of spermatozoa escaping, like smoke,from the terminal orifice of each tentaculum of a Halodactylus. Theanalogy of these cerearioids with the spermatozoa discovered byWagner in the tortuous generative tubes of the Actinia, indicatestheir real nature and importance in the generative economy of theBryozoa. Van Beneden has since communicated his discovery ofmale and female polype
RMPFN4TR–. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. The ovum a little more advanced in the tube. (After Bischoff.) The surface is perfectly smooth. Spermatozoa have penetrated the zona pellucida. The respira- tory chamber is formed between the latter and the yelk. The rotation of the yelk has commenced, as indicated by the arrows. The granular bodies ap- pear preparatory to the segmentation of the yelk. Several of these stages are seen commencing in the preceding figure. Rabbit. This change is preliminary to another oc- currence, which has been observed in the ova of many
RFM8NJXD–Human ovum, or egg, surrounded by numerous spermatozoa, computer illustration. In fertilisation, only a single sperm may successfully penetrate the ovum to fuse with the female nucleus. Barriers to be overcome include layers of follicular cells surrounding the ovum (corona radiata) and an underlying glycoprotein membrane, the zona pellucida. The membrane is digested by enzymes released from the acrosome, a cap on the head of the sperm: subsequent rapid chemical changes in the zona pellucida prevent competing sperm from entering.
RMW1TTKJ–Archive image from page 510 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0401todd Year: 1847 Spermatozoa partially expelled from the vesicles of developement of Nepa cinerea. The bundles in many cases disperse as soon as the mother cells are destroyed. But it still more frequently occurs that these bundles survive the existence of the cyst, the remainder of which then covers for some time to come (as in the singing birds, &c.) the anterior end of the bundle in a cap-like form. (Instances — Coleoptera, Neu- roptera, &c.) In this part, which is ge- ne
RM2ANH9GY–Quain's elements of anatomy . given at p. G98 of this volume. Introdtiction of the Spermatozoa into the Ovum.—The factof the actual entrance of spermatozoa within the zona or covering ofthe mammiferous ovum was first observed by Martin Barry in 1843,and although his statement was received with considerable hesitationby his contemporaries, it has since been repeatedly confirmed by theminute and careful investigation of many observers. In certain animals the spermatozoa have been seen to enter the cavityof the oxmn. by an obvious micropyle aperture, as first observed byRansom in fishes (No. 72),
![. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Developing Vesicles of the Spermatozoa from the Testicles of the Dog. siderable number of them in one common cyst is unusual; but they may, according to Kol- liffer's statement, amount to twenty. The size of the cyst naturally depends on the number and state of developement of the vesicles it encloses. Ordinarily it amounts to about 1 /// ! "' TotJ TfcT • On pursuing the genesis of the vesicles of developement, it will be found that they are produced in the interior of cells, according to the law of endogenous form Stock Photo](https://c8.alamy.com/comp/PFN5F4/the-cyclopdia-of-anatomy-and-physiology-anatomy-physiology-zoology-developing-vesicles-of-the-spermatozoa-from-the-testicles-of-the-dog-siderable-number-of-them-in-one-common-cyst-is-unusual-but-they-may-according-to-kol-liffers-statement-amount-to-twenty-the-size-of-the-cyst-naturally-depends-on-the-number-and-state-of-developement-of-the-vesicles-it-encloses-ordinarily-it-amounts-to-about-1-!-quot-totj-tfct-on-pursuing-the-genesis-of-the-vesicles-of-developement-it-will-be-found-that-they-are-produced-in-the-interior-of-cells-according-to-the-law-of-endogenous-form-PFN5F4.jpg ". The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Developing Vesicles of the Spermatozoa from the Testicles of the Dog. siderable number of them in one common cyst is unusual; but they may, according to Kol- liffer's statement, amount to twenty. The size of the cyst naturally depends on the number and state of developement of the vesicles it encloses. Ordinarily it amounts to about 1 /// ! "' TotJ TfcT • On pursuing the genesis of the vesicles of developement, it will be found that they are produced in the interior of cells, according to the law of endogenous form Stock Photo")
RMPFN5F4–. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Developing Vesicles of the Spermatozoa from the Testicles of the Dog. siderable number of them in one common cyst is unusual; but they may, according to Kol- liffer's statement, amount to twenty. The size of the cyst naturally depends on the number and state of developement of the vesicles it encloses. Ordinarily it amounts to about 1 /// ! "' TotJ TfcT • On pursuing the genesis of the vesicles of developement, it will be found that they are produced in the interior of cells, according to the law of endogenous form
RFM8NJXH–Human ovum, or egg, surrounded by numerous spermatozoa, computer illustration. In fertilisation, only a single sperm may successfully penetrate the ovum to fuse with the female nucleus. Barriers to be overcome include layers of follicular cells surrounding the ovum (corona radiata) and an underlying glycoprotein membrane, the zona pellucida. The membrane is digested by enzymes released from the acrosome, a cap on the head of the sperm: subsequent rapid chemical changes in the zona pellucida prevent competing sperm from entering.
RMW1TT64–Archive image from page 507 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0401todd Year: 1847 Spermatozoon of Helix pomatia. in the interior of its developing cell. (After Kolliher.) observations of Kolliker, the head is produced first, being at first of a less regular, un- wieldy shape. The tail is formed subse- quently, attaching itself in spiral windings to the internal surface of the cell wall. On the spermatozoa being sufficiently developed, the vesicle of developement is dissolved, and the spermatozoa get into the cavity of the exter- nal cell
RM2AJ0MDA–Lectures on the comparative anatomy and physiology of the invertebrate animals : delivered at the Royal College of Surgeons . , or by an oblongvesicle, as in the genus P/ioIcus, the ducts of both of which terminateanteriorly by two approximate orifices, or else by a common opening,as in Tegenaria {fig. 172, k), situated between the two pulmonarystigmata (ib. i, i). These abdominal testicular sacculi are, in fact, laden ARACITNTDA. 461 .it the breeding season ^Yith sperm-cells and their characteristic nucleior spermatoa, from which the spermatozoa are afterwards developed.The second or copulato
RMPFN5CC–. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Bundle of Spermatozoa in a cyst (Torpedo Narce). We will not venture to decide, however, whe- ther this difference is entirely attributable to the greater number of the cells of develope- ment ; and we are the less inclined to do so, as we have already seen, when investigating the spermatozoa of birds, that, even with an equal number of the formations alluded to, the grouping of the spermatozoa in the in- terior of the cyst may be different. This much, however, is certain, that the num- ber of the enclosed cells is not e
RFM8NJYF–Human ovum, or egg, surrounded by numerous spermatozoa, computer illustration. In fertilisation, only a single sperm may successfully penetrate the ovum to fuse with the female nucleus. Barriers to be overcome include layers of follicular cells surrounding the ovum (corona radiata) and an underlying glycoprotein membrane, the zona pellucida. The membrane is digested by enzymes released from the acrosome, a cap on the head of the sperm: subsequent rapid chemical changes in the zona pellucida prevent competing sperm from entering.
RMW1TT73–Archive image from page 507 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0401todd Year: 1847 Spermatozoon of Helix pomatia. easy spiral windings are also not unfrequently observed at the enlarged body. The mode of formation of these sperma- tozoa can usually be traced without any great difficulty. It usually takes place in the same way as in the animals already described, as proved by Kollikcr''s excellent researches. Even in the Gasteropods we may observe the deve- lopement of the spermatozoa in the interior of particular vesicles. The arrangement
RM2AWJBPC–Text-book of comparative anatomy . The oral opening and gastral cavity have heredisappeared in the same way as in the Cestoda. The body of theOrthonectidce is outwardly ringed, and between ectoderm and endodermhas a layer of ectodermal muscular fibres. In the Orthonectidcespermatozoa and eggs are produced in the endoderm, but in different II GASTRJZADJE 59 dissimilar individuals. In the Dicyemidce no spermatozoa have yetbeen discovered, but many egg-like germs, which apparently withoutfertilisation develop as eggs within the axial cell. The course of development is as follows. The egg or the u
![. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Spermatozoa of an Insect. The spermatozoa of the Hexapods are developed in the same endogenous man- ner, as among the Vertebrata. This process ma}' very easily be observed. The vesicles of developement, which measure pretty uniformly, when in a developed state, ^-0'" (they are smaller in many Diptera, Culex C^^'"), Musca, Fig. 367.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not Stock Photo](https://c8.alamy.com/comp/PFN5B2/the-cyclopdia-of-anatomy-and-physiology-anatomy-physiology-zoology-spermatozoa-of-an-insect-the-spermatozoa-of-the-hexapods-are-developed-in-the-same-endogenous-man-ner-as-among-the-vertebrata-this-process-ma-very-easily-be-observed-the-vesicles-of-developement-which-measure-pretty-uniformly-when-in-a-developed-state-0quot-they-are-smaller-in-many-diptera-culex-cquot-musca-fig-367-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitally-enhanced-for-readability-coloration-and-appearance-of-these-illustrations-may-not-PFN5B2.jpg ". The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Spermatozoa of an Insect. The spermatozoa of the Hexapods are developed in the same endogenous man- ner, as among the Vertebrata. This process ma}' very easily be observed. The vesicles of developement, which measure pretty uniformly, when in a developed state, ^-0'" (they are smaller in many Diptera, Culex C^^'"), Musca, Fig. 367.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not Stock Photo")
RMPFN5B2–. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Spermatozoa of an Insect. The spermatozoa of the Hexapods are developed in the same endogenous man- ner, as among the Vertebrata. This process ma}' very easily be observed. The vesicles of developement, which measure pretty uniformly, when in a developed state, ^-0'" (they are smaller in many Diptera, Culex C^^'"), Musca, Fig. 367.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not
RFM8NJXW–Human ovum, or egg, surrounded by numerous spermatozoa, computer illustration. In fertilisation, only a single sperm may successfully penetrate the ovum to fuse with the female nucleus. Barriers to be overcome include layers of follicular cells surrounding the ovum (corona radiata) and an underlying glycoprotein membrane, the zona pellucida. The membrane is digested by enzymes released from the acrosome, a cap on the head of the sperm: subsequent rapid chemical changes in the zona pellucida prevent competing sperm from entering.
RF2DAMBB2–Human testis, light micrograph. Seen here are spermatogonia, spermatocytes undergoing meiosis, spermatids, and spermatozoa.
RMW1TTM7–Archive image from page 510 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0401todd Year: 1847 Developing cells of the Spermatozoa of Culex. large nucleus-like body in their interior. In each of these vesicles, as V, Siebold has shown, a single spermatozoon is usually produced (fig. 368.). It attaches itself in numerous windings to the inner surface of the cell wall, until it has reached its full develope- ment. In the mean time the vesicle loses its original round shape, becoming stretched, and assuming the most various forms (fig. 369.). At last the
RM2ANHP0N–Quain's elements of anatomy . nt stages of development (fig.594). In different tubules of the same testis and even in parts of thesame tubule the condition of development of the spermatozoa may bevery various, and the epithehum presents corresponding differencesboth in the ntunber of its layers and the appearance of the cells. 688 THE TESTIS. In all cases, however, there is a complete or tolerably regular layer ofcubical or somewhat flattened cells which immediately lines the basementmembrane. A few of these outer or lining cells nsually present indica-tions of proliferation, the nuclens being
RMPG2M47–. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative. 348 COMPARATIVE ANATOMY The mode of development of the ova and spermatozoa is briefly as follows ;— Ora.—The cells of the germinal epithelium grow inwards amongst the stroma of the ovary in the form of clustered masses : some of these increase in size more than the others, and give rise to the ova, while the smaller cells form an investment of follicle round them, and serve as nutritive material. The investing cells multiply, and in Mammals a cavity containing a fluid is formed in the middle of each foUicle (Fig. 276)
RF2DAMBB6–Human testis, light micrograph. Seen here are spermatogonia, spermatocytes undergoing meiosis, spermatids, and spermatozoa.
RFM8NJXR–Sperm fertilizing egg, computer illustration. The sperm has an oval head and a hair-like tail which it beats with a whiplash motion to swim. The human female usually produces a single large egg from the ovary, while the male releases some 300 million much smaller sperm. The sperm travel through the uterus (womb) and up the fallopian tubes to reach the egg. The sperm must penetrate a thick layer around the egg; this penetration is aided by enzymes contained in the sperm's head. Only one sperm can fuse with the egg nucleus. Fertilisation enables male and female genetic material to be shared.
RMW1TTJN–Archive image from page 510 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0401todd Year: 1847 Developing cells of the Spermatozoa of Culex. large nucleus-like body in their interior. In each of these vesicles, as V, Siebold has shown, a single spermatozoon is usually produced (fig. 368.). It attaches itself in numerous windings to the inner surface of the cell wall, until it has reached its full develope- ment. In the mean time the vesicle loses its original round shape, becoming stretched, and assuming the most various forms (fig. 369.). At last the
RM2ANHHG5–Quain's elements of anatomy . 698 THE SPERMATOZOA. membrane lias been described by H. G-ibbes in other vertebrates, includingmammals, and he and Jensen also describe a long fine filament as bounding themembrane along its unattached border. This filament, which is attached to thehead at one end, is considerably longer than the tail itself, so that it as wellas the free edge of the membrane is thrown into undulating- coils (see fig. 602).Eetzius, who has still more recently investigated the subject, describes thetail as becoming abruptly narrowed near its extremity, which thus forms adistinct te
RMPG2M0R–. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative. URIXOGENITAL ORGANS 365 phores, which pass into a large vesicula seininalis at the base of the vas deferens; the Miillerian ducts are complete in the male, though small. Hernutplinidittsm occurs amongst Fishes. InMyxiiie the posterior part of the gonad usually first gives rise to spermatozoa, and subsequently the anterior part til ova, so that self-fertilisation is prevented. Serranus and Chryso- phrys, again, are hermaphrodite, and hermaphroditism has been occasionally observed in various other Fishes {e.g., Gadus mor
RFM8NJXT–Sperm fertilizing egg, computer illustration. The sperm has an oval head and a hair-like tail which it beats with a whiplash motion to swim. The human female usually produces a single large egg from the ovary, while the male releases some 300 million much smaller sperm. The sperm travel through the uterus (womb) and up the fallopian tubes to reach the egg. The sperm must penetrate a thick layer around the egg; this penetration is aided by enzymes contained in the sperm's head. Only one sperm can fuse with the egg nucleus. Fertilisation enables male and female genetic material to be shared.
RMW1TDY9–Archive image from page 475 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0401todd Year: 1847 Progressive development of vesicles of testis of Squalus cornubicus. a, portion of duct with a few nucleated cells, the primary or germinal cells of the future acini, at- tached to its walls ; b, c, d, e, f, primary cells, or acini, in successive stages ; g, one of the secondary cells in an immature state; h, a secondary cell elongated into a cylinder, each cell of its com- posite nucleus elongated into a spiral ; i, k, the spiral cells or spermatozoa free.
RM2AWFYAM–Text-book of comparative anatomy . ture animals they are retained at the best as rudiments. Thesperm formative cells are early gathered into special sperm sacs, inwhich they develop further and produce the ripe spermatozoa. Thesesperm sacs, formerly regarded as testes, are large vesicles whichdevelop on the dissepiments of the testicle segments as sac-like 260 COMPARATIVE ANATOMY CHAP. outgrowths of their posterior lamella?. They are divided internallyby lamella? into numerous compartments and chambers, in whichthe developing spermatozoa lie, and are in open communicationwith the body cavity.
RMPFN5A8–. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Spermatozoa partially expelled from the vesicles of developement of Nepa cinerea. The bundles in many cases disperse as soon as the mother cells are destroyed. But it still more frequently occurs that these bundles survive the existence of the cyst, the remainder of which then covers for some time to come (as in the singing birds, &c.) the anterior end of the bundle in a cap-like form. (Instances — Coleoptera, Neu- roptera, &c.) In this part, which is ge- nerally lengthened, the separate spermatozoa lie together
RFM8NJXK–Sperm fertilizing egg, computer illustration. The sperm has an oval head and a hair-like tail which it beats with a whiplash motion to swim. The human female usually produces a single large egg from the ovary, while the male releases some 300 million much smaller sperm. The sperm travel through the uterus (womb) and up the fallopian tubes to reach the egg. The sperm must penetrate a thick layer around the egg; this penetration is aided by enzymes contained in the sperm's head. Only one sperm can fuse with the egg nucleus. Fertilisation enables male and female genetic material to be shared.
RMW0PP8W–Archive image from page 109 of Der Mensch (1886-). Der Mensch dermensch01rankuoft Year: 1886- ä3efructung unb GiGutroidelunö. wirb 1677 angegeben. S){e carafteriftifdje eiücgUdjfeit biefer {(einen elntbe nuifste bei bem bamaligen tonbe ber enntniffe über bie (ementarftruftur ber DrganiiCMnen bie 3)ieinung (jemorrnfen, baf? biefe fo rafd) aftb I)in unb l;er id) [toenben fleinen, faul= quappennljnlidjen ebilbe waljte Spiere feien, unb man gab iljuen batjer hen Flamen Spermatozoa, amentiere. ielfac max man ber oollfonimen irrigen 9)ieinung, ba biefe „amen= tiere'' eigentH(e 9Jtenfd)en(aroen feie
RM2AWJTY5–Text-book of comparative anatomy . s glacialis, after Fol (from 0. Hertwig s Lehrluchder Entwicldungsgeschichte). One of the spermatozoa which have entered the mucilaginousenvelope comes in contact with the receptive prominence. In C the yolk membrane is formed. the protoplasm of the egg; the head (the remains of the originalnucleus) increases somewhat in size. As male pronucleus, it movesforward to meet the female pronucleus. Finally they fuse and formone single nucleus, the so-called segmentation nucleus. The egg isfertilised. It seems tolerably certain that where the egg envelopes havea mic
RMPFN5D0–. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Spermatozoa in the interior of the cysts (Toipedo Narce). ings of the body seem to be still wanting at this stage, or, at least, not to be perfectly developed. If the number of spermatozoa is only small in one cyst, they never group together into a bundle, whilst this is con- stantly occurring in the reverse case (fig- 352.). Fig. 352.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfe
RFM8NJXN–Sperm fertilizing egg, computer illustration. The sperm has an oval head and a hair-like tail which it beats with a whiplash motion to swim. The human female usually produces a single large egg from the ovary, while the male releases some 300 million much smaller sperm. The sperm travel through the uterus (womb) and up the fallopian tubes to reach the egg. The sperm must penetrate a thick layer around the egg; this penetration is aided by enzymes contained in the sperm's head. Only one sperm can fuse with the egg nucleus. Fertilisation enables male and female genetic material to be shared.
RM2AFYFK2–. The microscopic anatomy of the human body in health and disease (Volume 2). ocess of formation 112On the milk globules . . .200 On the structure of human spermatozoa . 224His supposition that the motions of spermato-zoa were produced by a ciliary apparatus 226His observation of spermatozoa in motion at the end of twenty-four hours . 227 On the development of spermatozoa . 229 On the degeneration of the testes of birds during winter .... 232On spermatozoa in male hybrids . 232On the coloration of the iris of birds . 255On the development of nerves . 388Waller, Dr. A. On the tongue of the frog
RMPFN4W1–. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 610 UTERUS AND ITS APPENDAGES. the latter and the zona pellucida, which in- terspace is filled by a transparent fluid, has been noticed in many mammalia, as the Guinea-pig, rabbit, &c. riff. 412.. The ovum a little more advanced in the tube. (After Bischoff.) The surface is perfectly smooth. Spermatozoa have penetrated the zona pellucida. The respira- tory chamber is formed between the latter and the yelk. The rotation of the yelk has commenced, as indicated by the arrows. The granular bodies ap- pear preparatory to
RFM8NJXP–Sperm fertilizing egg, computer illustration. The sperm has an oval head and a hair-like tail which it beats with a whiplash motion to swim. The human female usually produces a single large egg from the ovary, while the male releases some 300 million much smaller sperm. The sperm travel through the uterus (womb) and up the fallopian tubes to reach the egg. The sperm must penetrate a thick layer around the egg; this penetration is aided by enzymes contained in the sperm's head. Only one sperm can fuse with the egg nucleus. Fertilisation enables male and female genetic material to be shared.
RFPR1RMA–Pig sperm. Coloured scanning electron micrograph (SEM) of immature pig sperm from the epididymis. This immature sperm is characterised by a small amount of unshed residual cytoplasm below the head. The epididymis is a 7 metre long coiled tube that lies behind each testis, receiving sperm from them. The sperm mature as they pass slowly through this tube. Magnification: x4000 when printed at 10 centimetres wide.
RM2ANHND7–Quain's elements of anatomy . B WWi. Fig. 595.—Stages in the development of the spermatozOxV of the dog (Klein). in, membrana propria; d, epithelium ; e, lamina of connective tissue ; 1, 2, 3,daughter cells in different stages of development into spermatozoa ; s, developing sperma-tozoa in groups. Interstitial tissue, lymphatics, and blood-vessels.—The tissuewhich connects the seminiferous tubules is in some respects peculiar. Itconsists of fine fasciculi and lamina of areolar tissue, these being coveredby and partly composed of flattened epithelioid cells. Between the laminaeand fasciculi are
![. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. [102]. OVUM. tents of the vesicle, the more immediately germinal part of the egg is formed from the mixture of the two. However this may be, it seems not improbable, from the observations now referred to, that the spermatozoa are conveyed directly to the germinal part of the egg by the funnel of the micropyle. I shall afterwards have to state the more numerous instances in which, following its first discovery by J. Mtiller in the Holo- thuria, a micropyle has been detected in the ova of Invertebrate animals; and I may at Stock Photo](https://c8.alamy.com/comp/PFM9XW/the-cyclopdia-of-anatomy-and-physiology-anatomy-physiology-zoology-102-ovum-tents-of-the-vesicle-the-more-immediately-germinal-part-of-the-egg-is-formed-from-the-mixture-of-the-two-however-this-may-be-it-seems-not-improbable-from-the-observations-now-referred-to-that-the-spermatozoa-are-conveyed-directly-to-the-germinal-part-of-the-egg-by-the-funnel-of-the-micropyle-i-shall-afterwards-have-to-state-the-more-numerous-instances-in-which-following-its-first-discovery-by-j-mtiller-in-the-holo-thuria-a-micropyle-has-been-detected-in-the-ova-of-invertebrate-animals-and-i-may-at-PFM9XW.jpg ". The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. [102]. OVUM. tents of the vesicle, the more immediately germinal part of the egg is formed from the mixture of the two. However this may be, it seems not improbable, from the observations now referred to, that the spermatozoa are conveyed directly to the germinal part of the egg by the funnel of the micropyle. I shall afterwards have to state the more numerous instances in which, following its first discovery by J. Mtiller in the Holo- thuria, a micropyle has been detected in the ova of Invertebrate animals; and I may at Stock Photo")
RMPFM9XW–. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. [102]. OVUM. tents of the vesicle, the more immediately germinal part of the egg is formed from the mixture of the two. However this may be, it seems not improbable, from the observations now referred to, that the spermatozoa are conveyed directly to the germinal part of the egg by the funnel of the micropyle. I shall afterwards have to state the more numerous instances in which, following its first discovery by J. Mtiller in the Holo- thuria, a micropyle has been detected in the ova of Invertebrate animals; and I may at
RFPR1RK1–Pig sperm. Coloured scanning electron micrograph (SEM) of immature pig sperm from the epididymis. This immature sperm is characterised by a small amount of unshed residual cytoplasm below the head. The epididymis is a 7 metre long coiled tube that lies behind each testis, receiving sperm from them. The sperm mature as they pass slowly through this tube. Magnification: x4000 when printed at 10 centimetres wide.
RM2AWER3X–An introduction to the study of the comparative anatomy of animals . A. Fig- 32-A^ a free specimen of Monocystis a^Hs, nu, nucleus. 5, sperm-motber cells adhering to the parasite, i), a free monocystiscovered with ripe spermatozoa, and thus appearing as if coveredwith a coat of long cilia. C, a ripe cyst of Monocystis agiliscontainingnumerouspseudonavicellae/.rff. {A and .5, original;C, after Lankester.) is termed a zygote (Greek C^y^, a yoke, because the twoare yoked or joined together). The zygotes contract intospherical form, and each contributes to the formation of acommon transparent prot
RMPFTR5C–. Bees & bee-keeping; scientific and practical. A complete treatise on the anatomy, physiology, floral relations, and profitable management of the hive bee. Bee culture; Bees. 224 BEES AND BEE-KEEPING. larger, furnishing drones, because she possesses the extraordinary faculty of giving at will, or withholding, spermatozoa from the egg about to be deposited. Let us return to the study of her anatomy, for the purpose of unravelling the mystery of the mechanism by which this is accomplished.. Fig. 44.—Part of Spermatheca and Valve, with Appendicular Gland (Magnified Sixty times). sp, Spermath
RFPR1RK8–Pig sperm. Coloured scanning electron micrograph (SEM) of immature pig sperm from the epididymis. This immature sperm is characterised by a small amount of unshed residual cytoplasm below the head. The epididymis is a 7 metre long coiled tube that lies behind each testis, receiving sperm from them. The sperm mature as they pass slowly through this tube. Magnification: x4000 when printed at 10 centimetres wide.
RF2D0739E–Sperm in a fallopian tube. Coloured composition scanning electron micrograph (SEM) of human sperm travelling through a fallopian tube (oviduct) of a f
RM2AWJX28–Text-book of comparative anatomy . lements, cells areproduced which are equivalent to egg-germs, and which may be distinguishedas sperm germs. Whereas, however,the egg germs become eggs direct bymeans of growth and maturation, thesperm germs are still further divided i Y7^ 1, -> tozoa. «. Of a Mammal ; b, of a Turbel- and produce spermatozoa. We have larian> wi;h two accessory fla,,ella. Cj t?jalready seen a phenomenon similar, ;md e, of Nematoda; /, of a Crustacean; though not in all points parallel, in ..of a Salamander (with undulating mem-,, -. ° ,. 11 r ii 1 brane);7i, The commone
RMPFM8AG–. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. A, generative organs of Cynthia ampulla, situated in the fold of the intestine. (After Van Buneden.} a, stomach and its aperture (destitute of ceso - phagus);. b, rectum and anus; c, ovary, with its outlet into the cloaca; d, testicle, enveloping the edges of the ovary. B, magnified portion of the reproductive organs of Ascidia grossidaria. (After Van Beneden. ) a, testicle; b, ovary and ova. into the cloaca, and contains, or rather is almost composed of, spermatozoa, with dis- ciform heads and filamentous tails. The ova
RF2D073AD–Sperm in a fallopian tube. Coloured composition scanning electron micrograph (SEM) of human sperm travelling through a fallopian tube (oviduct) of a f
RM2AFY1F6–. The American journal of anatomy. bei den Arachni- den. I. tber die Spermatogenese der Skorpione. Arch, fiir Zellf.,Bd. 9.Suzuki, B. 1898 Notiz uber die Entstehung des Mittelstlickes der Samenfaden von Selachiern. Anat. Anzeiger, Bd. 15.Wilson, E. B. 1916 The distribution of the chondriosomes to the spermatozoa in scorpion. Science, N.S., 43 and Proceedings of Nat. Acad, of Sciences. PLATES 149 THE AMERICAN JOURNAL OF ANATOMY, VOL. 23, NO. 1 EXPLANATION OF FIGURES All figures were outlined with a Zeiss camera-lucida, at the level of the stageof the microscope. Lens used: Zeiss apochr. imm. 1
RMPFN5BP–. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Spermatozoon of Helix pomatia. in the interior of its developing cell. (After Kolliher.) observations of Kolliker, the head is produced first, being at first of a less regular, un- wieldy shape. The tail is formed subse- quently, attaching itself in spiral windings to the internal surface of the cell wall. On the spermatozoa being sufficiently developed, the vesicle of developement is dissolved, and the spermatozoa get into the cavity of the exter- nal cell {fig. 360.). Here they may usually Fig. 360.. Spermatozoa of Hel
RF2D073A4–Sperm in a fallopian tube. Coloured composition scanning electron micrograph (SEM) of human sperm travelling through a fallopian tube (oviduct) of a f
RM2CH8R6E–. Quain's elements of anatomy . ccount given at p. G98 of this volume. Introduction of the Spermatozoa into the Ovum.—The factof the actual entrance of spermatozoa within the zona or covering ofthe mammiferous ovum was first observed by Martin Barry in 1843,and although his statement was received with considerable hesitationby his contemporaries, it has since been repeatedly confirmed by theminute and careful investigation of many observers. In certain animals the spermatozoa have been seen to enter the cavityof the ovum by an obvious micropyle aperture, as first observed byEansom in fishes (N
RMPFN5C4–. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Spermatozoon of Helix pomatia. easy spiral windings are also not unfrequently observed at the enlarged body. The mode of formation of these sperma- tozoa can usually be traced without any great difficulty. It usually takes place in the same way as in the animals already described, as proved by Kollikcr''s excellent researches. Even in the Gasteropods we may observe the deve- lopement of the spermatozoa in the interior of particular vesicles. The arrangement of these parts only exhibits some deviation. In Helix or Clausil
![. On the anatomy of vertebrates [electronic resource] . s of foetation, the exclusion of the foetus is then termed4 birth. Sometimes the male assists in the process of exclusion. § 111. Semination of Hcematocrya.— The product of the testisin Fishes consists of e sperm-cells, spermatoa, and (spermatozoa,with very scanty fluid medium of suspension: the function isseasonal, and attended byrapid increase of the glands. 399This is greatest in OsseousFishes, in the testes of which,at the beginning of their {&)enlargement, the sperm-cells(cysts or (mother-cells) are Seen, fig. 399, CL, Containing Spe Stock Photo](https://c8.alamy.com/comp/2CNE57E/on-the-anatomy-of-vertebrates-electronic-resource-s-of-foetation-the-exclusion-of-the-foetus-is-then-termed4-birth-sometimes-the-male-assists-in-the-process-of-exclusion-111-semination-of-hcematocrya-the-product-of-the-testisin-fishes-consists-of-e-sperm-cells-spermatoa-and-spermatozoawith-very-scanty-fluid-medium-of-suspension-the-function-isseasonal-and-attended-byrapid-increase-of-the-glands-399this-is-greatest-in-osseousfishes-in-the-testes-of-whichat-the-beginning-of-their-enlargement-the-sperm-cellscysts-or-mother-cells-are-seen-fig-399-cl-containing-spe-2CNE57E.jpg ". On the anatomy of vertebrates [electronic resource] . s of foetation, the exclusion of the foetus is then termed4 birth. Sometimes the male assists in the process of exclusion. § 111. Semination of Hcematocrya.— The product of the testisin Fishes consists of e sperm-cells, spermatoa, and (spermatozoa,with very scanty fluid medium of suspension: the function isseasonal, and attended byrapid increase of the glands. 399This is greatest in OsseousFishes, in the testes of which,at the beginning of their {&)enlargement, the sperm-cells(cysts or (mother-cells) are Seen, fig. 399, CL, Containing Spe Stock Photo")
RM2CNE57E–. On the anatomy of vertebrates [electronic resource] . s of foetation, the exclusion of the foetus is then termed4 birth. Sometimes the male assists in the process of exclusion. § 111. Semination of Hcematocrya.— The product of the testisin Fishes consists of e sperm-cells, spermatoa, and (spermatozoa,with very scanty fluid medium of suspension: the function isseasonal, and attended byrapid increase of the glands. 399This is greatest in OsseousFishes, in the testes of which,at the beginning of their {&)enlargement, the sperm-cells(cysts or (mother-cells) are Seen, fig. 399, CL, Containing Spe
RMPFN5BA–. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Spermatozoa of Helix po- A group of Spermatozoa matia at their extrusion of Helix pomatia, from the mother cell. partially protruded from the mother cell. As soon as the heads of the spermatozoa have projected, the remainder of the mother cell lengthens itself, and becomes a delicate cylindrical envelope. These remains still ad- here to the spermatozoa when completely ex- tended, exhibiting the appearance of a couple of larger or smaller knobs on the tail: the same thing occurs in the spermatozoa of the frog. This mode o
![. On the anatomy of vertebrates [electronic resource] . Spermatozoa of Perca Spermatozoa of Colitis Spermatozoon of Petromyzon fluviatilis. cccvi. fossilis. cccvi. fiuviatilis. cocrvi. The spermatozoa in the Plagiostomes are very long, with ananterior cylindrical body. This is proportionally shortest inChimcera monstrosa, and is disposed in three spiral coils: inScyllium canicala it is about half the length of the spermatozoon, 403 404 405. B Spermatozoa within theA. Spermatozoa of B. Spermatozoon of sperm-cell {Torpedo Narce). Seymnus nicceensis. cccvi. Torpedo Narce. cccvi. cccvi. is straigh Stock Photo](https://c8.alamy.com/comp/2CNE56E/on-the-anatomy-of-vertebrates-electronic-resource-spermatozoa-of-perca-spermatozoa-of-colitis-spermatozoon-of-petromyzon-fluviatilis-cccvi-fossilis-cccvi-fiuviatilis-cocrvi-the-spermatozoa-in-the-plagiostomes-are-very-long-with-ananterior-cylindrical-body-this-is-proportionally-shortest-inchimcera-monstrosa-and-is-disposed-in-three-spiral-coils-inscyllium-canicala-it-is-about-half-the-length-of-the-spermatozoon-403-404-405-b-spermatozoa-within-thea-spermatozoa-of-b-spermatozoon-of-sperm-cell-torpedo-narce-seymnus-nicceensis-cccvi-torpedo-narce-cccvi-cccvi-is-straigh-2CNE56E.jpg ". On the anatomy of vertebrates [electronic resource] . Spermatozoa of Perca Spermatozoa of Colitis Spermatozoon of Petromyzon fluviatilis. cccvi. fossilis. cccvi. fiuviatilis. cocrvi. The spermatozoa in the Plagiostomes are very long, with ananterior cylindrical body. This is proportionally shortest inChimcera monstrosa, and is disposed in three spiral coils: inScyllium canicala it is about half the length of the spermatozoon, 403 404 405. B Spermatozoa within theA. Spermatozoa of B. Spermatozoon of sperm-cell {Torpedo Narce). Seymnus nicceensis. cccvi. Torpedo Narce. cccvi. cccvi. is straigh Stock Photo")
RM2CNE56E–. On the anatomy of vertebrates [electronic resource] . Spermatozoa of Perca Spermatozoa of Colitis Spermatozoon of Petromyzon fluviatilis. cccvi. fossilis. cccvi. fiuviatilis. cocrvi. The spermatozoa in the Plagiostomes are very long, with ananterior cylindrical body. This is proportionally shortest inChimcera monstrosa, and is disposed in three spiral coils: inScyllium canicala it is about half the length of the spermatozoon, 403 404 405. B Spermatozoa within theA. Spermatozoa of B. Spermatozoon of sperm-cell {Torpedo Narce). Seymnus nicceensis. cccvi. Torpedo Narce. cccvi. cccvi. is straigh
RMPG1R0K–. On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. SEMINATION OF HiEMATOCRYA. 591 106. Bundle of Spf?rmatozoa witliin the speriu-cell. TorpcdoNarcn. cccvr. a spermatozoon is developed, which escapes by solution of the spermatoal wall into the sperm-cell, as in fig. 405.' At this stage the body does not show the spiral disposition. If the sperm-cell has contained numerous spermatoa, the resulting spermatozoa group themselves into a bundle, as in fig. 406 : their bodies are contiguous and acquire the spiral form before escaping from the dilated sperm-cell. The spermatozoa
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