THE DIGESTIVE SYSTEM 



241 



b o rl C 



Fig. 225. — Liver of a pig. The lobules have artiticially shrunken from the inter- 

 lobular tissue, a; b, bile duct; c, hepatic artery; d, interlobular vein (a branch of the 

 portal) ;f, trabeculae;/, central vein. Highly magnified. (From Bremer's "Text Book 

 of Histology," after Radasch.) 



fr--_PORTAL VEIN- 



LOBULE-- 



-HEPATIC VEIN 

 A B C 



Fig. 226. — A, B, and C — diagrams of successive stages in the development of the 

 lobules of the liver. The subdivision of the liver anlage into lobules is correlated with 

 branching of the portal and hepatic veins. The branches of the hepatic vein are 

 intralobular, and those of the hepatic portal vein — shown in black — are interlobular. 

 (Redrawn after Mall.) 



