. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. 72 COMPARATIVE PHYSIOLOGY. and its resemblance to the segmentation of those invertebrate forms previously described may become apparent from an ex- amination of the accompanying figures.. !Pig. 70.—Sections of ovum of a rabbit, illustrating formation of the blastodermic vesi- cle (after E. Van Beneden). A, B, G, D, are ova in successive stages of develop- ment, z^, zona pellncida; ecit ectomeres, or outer cells; ent, entomeres, or inner cells. We shall return to

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. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. 72 COMPARATIVE PHYSIOLOGY. and its resemblance to the segmentation of those invertebrate forms previously described may become apparent from an ex- amination of the accompanying figures.. !Pig. 70.—Sections of ovum of a rabbit, illustrating formation of the blastodermic vesi- cle (after E. Van Beneden). A, B, G, D, are ova in successive stages of develop- ment, z^, zona pellncida; ecit ectomeres, or outer cells; ent, entomeres, or inner cells. We shall return to
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Image ID: RE04NX
. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. 72 COMPARATIVE PHYSIOLOGY. and its resemblance to the segmentation of those invertebrate forms previously described may become apparent from an ex- amination of the accompanying figures.. !Pig. 70.—Sections of ovum of a rabbit, illustrating formation of the blastodermic vesi- cle (after E. Van Beneden). A, B, G, D, are ova in successive stages of develop- ment, z^, zona pellncida; ecit ectomeres, or outer cells; ent, entomeres, or inner cells. We shall return to the development of the mammalian ovum later; in the mean time we present the main features of develop- ment in the bird. Remembering that the development of the embryo proper takes place within the pellucid area only, we point out that the area opaca gradually extends over the entire ovum, inclosing the yelk, so that the original disk which lay like a watch-glass on the rest of the ovum, has grown into a sphere. That portion of this area nearest the pellucid zone (area vasculosa) develops blood-vessels that derive the food-supplies, which replenish the blood as it is exhausted, from the hypoblast of the area opaca.. 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 perfectly resemble the original work.. Mills, Wesley, 1847-1915. New York, Appleton

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