STEUCTUBE OF GLAKDS. 



thicker, and then they run quite parallel to one another to 

 their termination (fig. 262). 



[ 4 2 a. Among the whole of the vertebrata, the parts which 

 are the efficient agents of 

 secretion in the liver are 

 so intimately connected 

 into a compact and little 

 lobular organ, by means 

 of the vessels and cellular 

 substance, that it is ex- 

 tremely difficult to form a 

 proper notion of its struc- 

 ture. Perhaps the follow- 

 ing is the true account of Fi S- 263. A, four lobules from the 

 th? stniptnrp of the liver liver of a human subject forty years of age, 

 er ' magnified twice; a branch of the hepatic 

 illy formed in man vein> a> receives a more minutely ramified 

 It twig from each lobule. B, some of the 

 cells of which the lobules of the liver are 

 composed, seen under a magnifying power 



and the mammalia : 



is easy to obtain convic- 



tiou 0*f the fact that the 



-' ** 



ends of the secreting parts , 



of the liver are lear-like 

 lobules with blunt projec- 

 tions, which, in prepara- 

 tions of the organ, are 

 most apt to remain at- 

 tached to the minute ve- 

 nous twigs (fig. 263, A, a, 

 and 264, a, b, b). These 

 lobules are composed of 

 compact angular and 

 rounded cells (fig. 263, 

 B). Betwixt the several di- 

 visions of the cells of the 

 individual lobules, the 



"" 



Fig. 264.- 



a branch of the hepatic 

 vein with the tributary twigs of which the 

 lobules of the liver are connected, as leaves 

 are with the final branches of a tree. The 

 branches of the gall-ducts venous ramuscles (venes intralobulares) lie 

 penetrate (fig. 266), and in the middle of each lobule, as is seen in 

 e fom anastomosing ^ * ST^tpaS 

 retes, which surround sin- lobules magnified. After Kiernan. * 

 gle groups of cells like 



islets. Some observers describe the final ends of the secreting 

 element of the liver of mammals as hollow acini or vesicles 



