. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. 89 COMPARATIVE PBT8I0L001. i ; • oharaoteriitio body, aUantoin, reUtod to urio acid, una, etc. Certain bodiei, being probably intpiaiated allantoic fluid, have been termed "; They may either float free in the fluid or be attached to the allantoii by a slender pedicle. The relation of the parta deaoribed above will become clearer after a study of the accompany
. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. 89 COMPARATIVE PBT8I0L001. i ; • oharaoteriitio body, aUantoin, reUtod to urio acid, una, etc. Certain bodiei, being probably intpiaiated allantoic fluid, have been termed "; They may either float free in the fluid or be attached to the allantoii by a slender pedicle. The relation of the parta deaoribed above will become clearer after a study of the accompanying outa and thoae of preceding pagea, in which the allantois ii Fia. M.—Bst«rior of ohorU lae; mate. (CIuniTMn.) A, body; B. 0. oonitw. Tht TlMOlta.—Thia itmcture, which variea greatly in com- plexity, may be regarded as the result of the union of structures existing for a longer or shorter period, free and largely inde- pendent of each other. With evolution there is differentiation and complication, so that the placenta usually marks the site where structures have met and fused, differentiating a new or- gan; while corresponding atrophy, obliteration, and fusion take place in other regions. AU placentas are highly vascular, all are villous, all dis- charge similar functions in providing the embryo with nourish- ment and eliminating the waste of its cell-life (metabolism). In structural details they are so different that classiflcationB of wammfll* have been founded upon their resemblances and dif- ferences. They will now be briefly described. In marsupials the yelk-sac is both large and vascular; the allantois small but vascular; the former is said (Owen) to be attached to the subaonal membrane, the latter not; but no villi, and consequently no true chorion, is developed. All mammals. 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
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Keywords: ., bookauthormillswes, bookcentury1800, bookdecade1890, bookyear1890
