. The elasmobranch fishes . C D Fig. 195. Diagram of development of hepatic portal system in Elasmobranchs, ventral view. (From Eabl, modified.) , anterior cardinal vein; , caudal vein; 7;.^;., hepatic vein; Iv., liver capillaries; om., omphalomesenteric vein; , postcardinal; , posterior intestinal vein; , renal portal vein; , subintestinal (intraintestinal) vein; , sinus venosus; , vitelline vein. mesenteric. The right vein remains rudimentary, but the left omphalomes- enteric becomes an important vessel (). When the developing liver comes in contact wi
. The elasmobranch fishes . C D Fig. 195. Diagram of development of hepatic portal system in Elasmobranchs, ventral view. (From Eabl, modified.) , anterior cardinal vein; , caudal vein; 7;.^;., hepatic vein; Iv., liver capillaries; om., omphalomesenteric vein; , postcardinal; , posterior intestinal vein; , renal portal vein; , subintestinal (intraintestinal) vein; , sinus venosus; , vitelline vein. mesenteric. The right vein remains rudimentary, but the left omphalomes- enteric becomes an important vessel (). When the developing liver comes in contact with the omphalomesenteric the latter vessel sends branches into the tissue of the liver and divides into two parts, each of which forms a series of capillaries in the liver (Iv. fig. 195c). After the absorption of yolk, and the consequent loss of the vitelline veins, the main stem of the hepatic portal sys- tem is along the subintestinal line. This vein in the adult is carried in with the develo])ing valve into the valvular intestine, as the intraintestinal, to drain the free margin of the valve. There is next formed the posterior intestinal or mesenteric vein (, fig. 195b-c). Blood now empties by the united sub- intestinal and posterior intestinal into the hepatic portal and this empties into the liver. From the liver the blood is collected and passes to the sinus venosus
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