. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. 108 COMPARATIVE PHYSIOLOGY. An examination of the figures and subjoined descriptions must suffice to convey a general notion of the subsequent prog- yji. MP:. Fig. 114.—Embryo at end of fourth day, seen as a transparent object (Foster and Balfour). CH, cerebral hemisphere; F. B, fore-brain, or vesicle of third ventricle (thalamencephalon), with pineal eland (Pn) projecting; M. B, mid-brain; , cerebellum; IV. V, fourth ventricle; L, lens; chs, choroid slit; Ce
. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. 108 COMPARATIVE PHYSIOLOGY. An examination of the figures and subjoined descriptions must suffice to convey a general notion of the subsequent prog- yji. MP:. Fig. 114.—Embryo at end of fourth day, seen as a transparent object (Foster and Balfour). CH, cerebral hemisphere; F. B, fore-brain, or vesicle of third ventricle (thalamencephalon), with pineal eland (Pn) projecting; M. B, mid-brain; , cerebellum; IV. V, fourth ventricle; L, lens; chs, choroid slit; Cen. V, auditory vesicle; sm, superior maxillary process; IP, 2F, etc., first, second, etc., visceral folds; K fifth nerve; VII, seventh nerve; G, Ph, glossopharyngeal nerve; Pg, pneumogastric. The distribution of these nerves is also indicated; ch, noto- ohord; Ht, heart; MP, muscle-plates; W, wing; H. L, hind-limb. The amnion has been removed. At, allantois protruding from cut end of somatic stalk SS. ress of the embryo. Special points will be considered, either in a separate chapter now, or deferred for treatment in the body of the work from time to time, as they seem to throw light upon the subjects under discussion. DEVEIfOMENT OF THE VASCULAR SYSTEM IN VER- TEBRATES. This subject has been incidentally considered, but it is of such importance morphological, physiological, and pathological, as to deserve special treatment. In the earliest stages of the circulation of a vertebrate the arterial system is made up of a pair of arteries derived from the single bulbus arteriosus of the heart, which, after passing foi^. 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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