. The comparative anatomy of the domesticated animals. Veterinary anatomy. 922 itself from this germ, and passing backward to serve, at a later period, in forming the persistent tooth. 3. The liver.—This gland commences to be developed very early in all the species. It apj)ears on the surface of the duodenum in the form of two or more buds, according to the number of lobules in the adult liver. To these external buds are correspond- Fig. 448. jjjg internal ones, arising from the intestinal epithelium. The first enlarge and envelope the omphalo- mesenteric vein ; the second ramify
. The comparative anatomy of the domesticated animals. Veterinary anatomy. 922 itself from this germ, and passing backward to serve, at a later period, in forming the persistent tooth. 3. The liver.—This gland commences to be developed very early in all the species. It apj)ears on the surface of the duodenum in the form of two or more buds, according to the number of lobules in the adult liver. To these external buds are correspond- Fig. 448. jjjg internal ones, arising from the intestinal epithelium. The first enlarge and envelope the omphalo- mesenteric vein ; the second ramify in their interior, and form the system of biliary canals. The liver grows rapidly, and, towards the third month, almost entirely fills the abdominal cavity ; at a later j)eriod its growth is less opaGiN OF THE LIVER FROM THE INTESTINAL niarkcd, although at birth it is yet WALL IN THE EMBR\'o OF THE FOWL, ON THE proportionally larger than in adult FOURTH DAY OF INCUI5ATI0N. J^-fg a, Heart; 6, Intestine ; c, Everted portion, giving 4^ Pancreas. — The pancreaS origin to liver: rf, Liver; e. Portion ofvitel- £ i. ti ai t line vesicle. "^ vil«i g^.g^ appear, like the salivary glands, in the form of a solid cellular bud, which afterwards is channeled into ramescent cavities. 5. Spleen.—According to Bischoff, this body is developed, during the second month, on the large curvature of the stomach. Arnold states that it is formed at the same time as the liver, in a strip extending from the stomach to the duodenum. It subsequently separates from the pancreas and becomes fixed to the stomach, where its elements Fig. 449. assume the character of spleen tissue. DEVELOPMENT OF THE GENITO-TTEINAEY APPARATUS. The development of the genital is related to that of the urinary organs, as the apj)aratus they form have some parts in common. Immediately after the formation of the intes- tines, the genito-urinary organs are supplied by the Wolffian bodies. These, also named the primordial
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