. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. 76 COMPARATIVE PHYSIOLOGY. yelk-sac (umbilical vesicle of the mammalian embryo). The manner in which this takes place will appear upon an inspec- tion of the accompanying figures. Very early in the history of the embryo two eminences, the head and the tail folds, arise, and, curving over toward each Fio. 76.—Diagrammatic longitadlnal section throngh the axis of an embiyo chick (after Foster and Balfour). N. C, Neural canal; Oh, notocbord; Fg, foregut; F.
. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. 76 COMPARATIVE PHYSIOLOGY. yelk-sac (umbilical vesicle of the mammalian embryo). The manner in which this takes place will appear upon an inspec- tion of the accompanying figures. Very early in the history of the embryo two eminences, the head and the tail folds, arise, and, curving over toward each Fio. 76.—Diagrammatic longitadlnal section throngh the axis of an embiyo chick (after Foster and Balfour). N. C, Neural canal; Oh, notocbord; Fg, foregut; F. So, somatopleure; F. Sp, splanchnopleure; Sp, splanchnopleure, forming lower wall of foregut; Ht, heart; ^, pleuroperitoneal cavity; Am, amniotic fold; F, epiblast; M, mesoblast; H, hypoblast. other, meet after being joined by corresponding lateral folds. Fusion and absorption result at this meeting-point, in the inelosure of one cavity and the blending of two others. These folds constitute the amniotic membranes, the inner of which. 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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