238 



EXCKETKW. 



distributed in the lobules by this lobular plexus, is collected 

 by venous radicles of considerable size into a single central 

 vessel in the long axis of the lobule, called the intralobular 

 vein. A single lobule, surrounded with an interlobular 

 vessel, showing the lobular capillary plexus, and the central 

 vein (the intralobular vein) cut across, is represented in 

 Fig. 9. 



FIG. 9. 





Transverse section of a single hepatic lobule. 1, Intralobular vein, cut across ; 2, 2, 2, 2, 

 Afferent branches of the intralobular vein : 8, 3, 3, 3, 3, 3, 3, 3, 3, Interlobnlar branches 

 of the portal vein with its capillary branches, forming the lobular plexus, extending 

 to the radicles of the intralobular vein. (SAPPEY. Traite d'anatomie, Paris, 1857, 

 tome iii., p. 297.) 



With regard to the mode of origin of the hepatic duct in 

 the substance of the lobule, recent researches have shown 

 that it begins by a very fine anastomosing plexus of vessels, 

 with amorphous walls, situated between the liver-cells ; but 

 there are many different opinions on this subject, and we 

 will defer its full consideration until we take up the anatomy 

 of the secreting structures in the lobules. 



Origin and Course of the Hepatic Veins. The blood 

 distributed in the lobular capillary plexus furnishes the ma- 

 terials for the formation of bile, and undergoes those changes 



