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HANDBOOK OF PHYSIOLOGY. 



veins by means of the small intralobular veins has been likened to a twig 

 having leaves without footstalks the lobules representing the leaves, 

 and the sublobular vein the small branch from which it springs. 



Fig. 271. 



Fig. 270 Section of a portion of liver passing longitudinally through a considerable hepatic 

 vein, from the pig. H. hepatic venous trunk, against which the sides of the lobules (/) are applied; 

 h, h, /i, sublobular hepatic veins, on which the bases of the lobules rest, and through the coats of 

 which they are seen as polygonal figures; t, mouth of the intralobular veins, opening into the sub- 

 lobular veins; i', intralobular veins shown passing up the centre of some divided lobules; Z, I, cut 

 surface of the liver; c, c, walls of the hepatic venous canal, formed by the polygonal bases of the 

 lobules, x 5. (Kieman.) 



Fig. 271. Portion of a lobule of liver, a, bile capillaries between liver-cells, the network in 

 which is well seen; 6, blood capillaries. X 350. (Klein and Noble Smith.) 



The hepatic artery, the chief function of which is to distribute blood 

 for nutrition to Glisson's capsule, the walls of the ducts and blood-ves- 

 sels, and other parts of the liver, is distributed in a very similar manner 



Fig. 272 -Hepatic cells and bile capillaries, from the liver of a child three months' old. Both 

 figures represent fragments of a section carried through the periphery of a lobule The red cor- 

 puscles ot the blood are recognized by their circular contour; vp, corresponds to an interlobular 

 vein m immediate proximity with which are the epithelial cells of the biliary ducts, to which, at the 

 lower part of the figures, the much larger hepatic cells suddenly succeed. (E. Hering.) 



to the portal vein, its blood being returned by small branches either 



