. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. <^.. Fig. 82.—Diagram of an embryo showing the relations of the vascular allantois to the villi of the chorion (Cadiat). e, enibryo lying in the cavity of the amnion; ys, yelk-sac^ a/, allantois; A. F, allantoic vessels dipping into the villi of the chorion; ch, chorion. In the mare especially these parts can be readily distin- guished. From the connection of the portion that ultimately forms the bladder with the main sac, as indicated above, there is ground
. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. <^.. Fig. 82.—Diagram of an embryo showing the relations of the vascular allantois to the villi of the chorion (Cadiat). e, enibryo lying in the cavity of the amnion; ys, yelk-sac^ a/, allantois; A. F, allantoic vessels dipping into the villi of the chorion; ch, chorion. In the mare especially these parts can be readily distin- guished. From the connection of the portion that ultimately forms the bladder with the main sac, as indicated above, there is ground for regarding the allantoic fluid in the later stages of gestation, at all events, as a sort of urine. This fluid is at an ear- ly period abundant and colorless, later yellowish, and finally brown. Since at one time it contains albumen and sugar, it may serve some purpose in the nutrition of the foetus. When most suggestive of urine in the latest stages of gestation, it contains 6. Fia. 83.—Diagram of the foetal membranes of the Virginian opossum (Haddon, after Os- bom). Two villi are shown greatly enlarged. The processes of the cells, which have been exaggerated, doubtless correspond to the pseudopodia described by Caldwell, al, allantois; am, amnion; s. t, sinus termi- nalis; , subzonal membrane; v, villi on the subzonal membrane in the region of the yelk-sac; ys, yelk-sac. The vascular splanchnopleure (tm>oblast and mesoblast) is indicated by the black 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 Mills, Wesley, 1847-1915. New York, Appleton
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