. Quain's elements of anatomy . the fouith weekof foetal life, two umbilical veins are seen coming from the placenta, and unitingto form a short trunk, which opens into the common vitelline vein. Yerysoon the right vitelline vein and right umbilical vein disappear. In connectionwith the common trunk of these veins, proceeding to the liver, two sets ofvessels make their appearance in the early stage of its growth. Thosefurthest from the heart, named vcnce licpatlcce adveJicntes, become the right andleft divisions of the poital vein ; the others are the hepatic veins, vcnce hepatlccerevclientes.
. Quain's elements of anatomy . the fouith weekof foetal life, two umbilical veins are seen coming from the placenta, and unitingto form a short trunk, which opens into the common vitelline vein. Yerysoon the right vitelline vein and right umbilical vein disappear. In connectionwith the common trunk of these veins, proceeding to the liver, two sets ofvessels make their appearance in the early stage of its growth. Thosefurthest from the heart, named vcnce licpatlcce adveJicntes, become the right andleft divisions of the poital vein ; the others are the hepatic veins, vcnce hepatlccerevclientes. The portion of vessel interventag between those two sets of veias 872 THE BLOOD-VASCULAK SYSTEM. forms the (hictns rejiosus. and the part above the hepatic vein, being subsequentlyjoined by the ascending vena cava, forms the upper extremity of that vein. Intothe remaining or left vitelline vein there open the mesenteric and splenic part above the latter forms the trunk of the portal vein; and the portion Fi£c. Fig. 781. DiAGEAJIS ILLUSTRATING THE DEVELOPMENT OP THE GREAT VEINS. (After Kolliker.) A, plan of tbe principal veins of thefcetus of about four weeks, or soon afterthe first formation of the vessels of tbeliver and the vena cava inferior. B, veins of the liver at a somewhateailier period. C, principal veins of the foetus afterthe establishment of the placental circu-lation. D, veins of the liver at the sameIJeriod. dc, the right and left ducts of Cuvier ;ca, the right and left cardinal veins;j, j, the jugular veins ; s, the subclavianveins ; az, the azygos vein ; u, the um-bilical or left umbilical vein; u, in B,the temporary right umbilical vein; o, thevitelline vein; o, the right; m, themesenteric veins; p, the portal vein ;P, P, the venEe advehentes ; I, the duc-tus venosus; V, V, the hepatic veins ;ci, vena cava inferior; il, the divisionof the vena cava inferior into commoniliac veins; cr, the external iliac orcrural veins ; /;, the hypogastric or
Size: 1075px × 2326px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., boo, bookcentury1800, booksubjectanatomy, booksubjecthumananatomy
