292 STUDIES IN ADVANCED PHYSIOLOGY. 



should be used in merely nourishing inactive ducts and 

 passive connective tissue, and it is therefore quite probable 



Fig. 119. DIAGRAMMATIC REPRESENTATION OF TWO HEPATIC LOBULES. (After Schafer.) 

 P, interlobular branches of portal vein ; h, intralobular vein ; S, sublobular vein ; the 

 lobular plexus of capillaries is plainly shown. 



that much of the blood of the hepatic artery is mixed with 

 the blood from the portal vein in the lobular capillaries of 

 each lobule. 



After the mixed blood passes through the lobular plexus 

 it is collected in the center of each plexus in a small vein 

 called the intralobular vein, a word signifying, of course, 

 the vein within, and not between the lobules. The intra- 

 lobular veins carry the blood out of the lobules, and uniting 

 with the intralobular veins of neighboring lobules form the 

 siib-lobular veins, which, by uniting with other similar 

 veins finally form the hepatic veins which carry the blood 

 just passed through the liver in the manner described into 

 the vena cava. The hepatic veins are usually several in 

 number, and as the vena cava runs apparently right through 

 the liver they are very short indeed, and are nothing more 

 than veins in the liver substance itself. The interlobular 

 bile-ducts also send capillary projections into each lobule, 

 which, however, do not meet in the center, each capillary 

 duct ending, or more properly speaking, beginning, blind 



