THE LIVER 



109 



liver, to leave its substance in two divisions one from the 

 right and one from the left lobe. These two unite to form 

 the hepatic duct which, running a course of about one and a 

 half inches, is joined at an acute angle by the cystic duct 

 to form the common bile duct, or the ductus communis 

 choledochus. The last penetrates obliquely the duodenal 



Branch of portal vein. 



Large interlobular bile duct. 



Interlobular connective 



Central veins 



Central vein. 



FIG. 46. From a horizontal section of human liver. X4. 



Three central veins, cut transversely, . represent each a center of as many 

 hepatic lobules, that at the periphery are but slightly denned from their neigh- 

 bors. Below and to the right of the section the lobules are cut obliquely and 

 their boundaries cannot be distinguished. (From Stohr.) 



wall and discharges the bile into the intestine. The cystic 

 duct has its origin at the apex of the gall bladder, and is 

 about one inch long. The common bile duct has an average 

 length of three inches. (See Fig. 43.) 



Gall Bladder. The gall bladder has an oval shape with its 

 large end forward. It is on the under surface of the liver, 

 the peritoneum running over (or rather under) it. It has a 

 mucous lining and the remainder of its structure is chiefly 



