. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative. 332 COMPARATIVE ANATOMY the yolk-sac, and uniting into a single trunk before opening into the heart. As the liver becomes developed, a portal circulation arises, and the main trunk of the vein, where it passes through the liver, disappears. In the meantime, the coeliac and mesenteric veins have become developed, and all the blood from them, as well as from the vitelline veins, now passes through a common trunk, the hepatic portal vein, into the capillaries of the liver, whence it. Fig. 270, c.—Reference to lettering on
. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative. 332 COMPARATIVE ANATOMY the yolk-sac, and uniting into a single trunk before opening into the heart. As the liver becomes developed, a portal circulation arises, and the main trunk of the vein, where it passes through the liver, disappears. In the meantime, the coeliac and mesenteric veins have become developed, and all the blood from them, as well as from the vitelline veins, now passes through a common trunk, the hepatic portal vein, into the capillaries of the liver, whence it. Fig. 270, c.—Reference to lettering on previous page. reaches the sinus venosus through the hepatic veins. The vitelline veins gradually disappear as the yolk-sac becomes reduced. In addition to these vessels, the umhilical vein must also be mentioned. This vessel is originally paired, and corresponds genetically to the lateral veins of Elasmobranchs and to the abdominal or epigastric vein of Ceratodus and Amphibians. It is situated originally in the body-walls, and comes into rela- tion with the allantois (pp. 9 and 337), opening eventually into the. 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 Wiedersheim, Robert, 1848-1923; Parker, William Newton, 1857-1923. London, Macmillan
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