PANCREAS AND LIVER, 



155 



Fig. 145. — Finest biliary passages of the rabbit's 

 liver ; <r, blood-vessels ; i, hepatic cells ; c, biliary 

 capillaries. 



Years ago, Andrejevic had already correctly asserted that 

 the blood and biliary capillaries never touched each other, 

 but rather that the body of a hepatic cell always lies between 

 them as a separating structure. 



The livers of the amphibia and reptiles, and even of birds, 

 show this most distinctly. Nevertheless, the more compli- 

 cated relations of the mam- 

 malial liver yield the same 

 result (Fig. 145), although 

 with more trouble, to the 

 attentive observer. We 

 see the blood-vessels (a) 

 in part transversely, in 

 part longitudinally. The 

 biliary capillaries (c) are 

 in repeated contact with 

 the hepatic cells {b) ; but 



portions of the cell body always remain as intervening parts 

 between these and the capillary vessels of the passage. 



Our figure teaches, furthermore, that biliary capillaries 

 occur only at the contiguous surfaces of two cells. We shall, 

 therefore, have to regard the extremely thin walls of the 

 capillaries as the product of adjacent cells which has become 

 hardened. 



The lymphatics run in the capsule of Glisson in the same 

 manner as the portal vein, hepatic artery, and biliary ducts. 

 Having entered the lobule, they invest the capillary blood- 

 vessels (MacGillavry, Frey, Biesiadecky and Asp). The deli- 

 cate external wall of these " perivascular " lymph passages is 

 without doubt the thin membrana propria of the hepatic cell 

 trabeculae. 



Let us, finally, look after the efferent biliary canals. 



These canals also show between the lobules a membrana 

 propria covered with low cylinder cells. Later, the walls 

 become connective tissue, the cells are higher and have a 

 seam which is permeated by porous canals (p. 8). 



In the largest canals passing out from the hepatic paren- 





