. Anatomy, descriptive and surgical. he blood iscarried into the lobule by finebranches which pierce its wall,and then converge from the cir-cumference to the centre of thelobule, forming a number of lon-gitudinal vessels which are con-nected by transverse or horizon-tal branches (Fig. 594). In theinterstices of the network of ves-sels thus formed are situated, asbefore said, the liver-cells; andhere it is that, the blood beingbrought into intimate connectionwith the liver-cells, the bile issecreted. Arrived at the centreof the lobule, all these minutevessels empty themselves into, . , one vei
. Anatomy, descriptive and surgical. he blood iscarried into the lobule by finebranches which pierce its wall,and then converge from the cir-cumference to the centre of thelobule, forming a number of lon-gitudinal vessels which are con-nected by transverse or horizon-tal branches (Fig. 594). In theinterstices of the network of ves-sels thus formed are situated, asbefore said, the liver-cells; andhere it is that, the blood beingbrought into intimate connectionwith the liver-cells, the bile issecreted. Arrived at the centreof the lobule, all these minutevessels empty themselves into, . , one vein of considerable size which runs down the centre of the lobules from apex to base, and is called theintralobular vein At the base of the lobule this vein opens directly into the sub-lobular vein, with which the lobule is connected, and which, as before mentioned,is a radicle of the hepatic vein. The sublobular veins, uniting into larger andlarger trunks, end at last in the hepatic veins, which do not receive any intralob- Fig. Horizontal Section of Liver (dog): the vena portae has been in-jected : a, trunk of interlobular vein ; b, trunk of intralobularvein. A dense system of capillary vessels lies between them GALL-BLADDER. 895 ular veins. Finally, the hepatic veins, as mentioned at p. 634, converge to formthree large trunks which open into the vena cava inferior, while that vessel is situ-ated in the fissure appropriated to it at the back of the liver. 3. The Ducts.—Having shown how the blood is brought into intimate relationwith the hepatic cells in order that the bile may be secreted, it remains now only toconsider the way in which the secretion, having been formed, is carried away. Sev-eral views have prevailed as to the mode of origin of the hepatic ducts: it seems,however, to be clear that they commence by little passages which are formed between the cells, and which have been termedintercellular biliary passages or bile-cajjil-laries (Fig. 595). These passages
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