File:Carpenter's principles of human physiology (1881) (14595222887).jpg

Identifier: carpentersprinci00carp (find matches)
Title: Carpenter's principles of human physiology
Year: 1881 (1880s)
Authors: Carpenter, William Benjamin, 1813-1885 Meneses, Henry Power
Subjects: Human physiology Physiology
Publisher: London : J. & A. Churchill
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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; ha, hepaticaj advehentes; hr, hepa- their branches over the Yolk-sac, ticse revehentes; m, mesenterica; da, sinus venosus; they become the vitelline vesssls, still tlri^superiS15 Pvena P°rt8e; h limalis; mmesenopening by two veins into the heart, and effecting the absorption of the yolk. With the formation of the intestine,however, the vessel of the right side disappears, the left alone remaining(Fig. 343, 2, om), which is soon joined by a small mesenteric vessel from theintestine (Fig. 343, 3, m). Before this is accomplished, however, the Allantoishas been developed, and to this organ two large branches pass from the IliacArteries, which are named umbilical arteries; the blood returning from itafter aeration enters the two Venae umbilicales which pass forwards and openinto the common trunk of the Venae omphalo-mesaraicaa (Fig. 343, 1, uu).The Venae umbilicales rapidly increase in size, preponderating so much overthe only remaining Vena omphalo-mesaraica, into which they originally
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922 OF GENERATION : EMBRYONIC DEVELOPMENT. discharged their contents, that the latter now appears to be merely a tributary-branch. As the Liver becomes developed, it surrounds the trunk of theumbilical vein, the portion thus surrounded taking the name of the Ductusvenosus (Fig. 348, v), which soon forms a twofold system of tubes withinthat gland, the one conveying the blood to the liver, the Venae hepaticaeadvehentes; the others returning the blood from the gland substance to theumbilical vein again, and constituting the Vense hepaticee revehentes. The Fig. 344. AA

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