DIGESTIOX. 



these vessels are filled by the liver cells. These cells 

 (fig. 84) "which make up a great portion of the substance 

 of the organ, are rounded or polygonal from about -g-i-g. to 

 1 T OOU of an inch in diameter, containing well-marked nuclei 

 and granules, and having sometimes a yellowish tinge, 

 especially about their nuclei ; frequently, they contain also 

 various sized particles of fat (fig. 84 B). Each lobule is 

 vary sparingly invested by areolar tissue. 



d a 



To understand the 

 distribution of the 

 blood-vessels in the 

 liver, it will be well 

 to trace, first, the two 

 blood-vessels and the 

 duct which enter the 

 organ on the under 

 surface at the trans- 

 verse fissure, viz., the 

 portal vein, hepatic 

 artery, and hepatic 

 duct. As before re- 

 marked, all three 

 run in company, and 

 their appearance on 

 longitudinal section 

 is shown in fig 85 Running together through the substance 

 of the liver, they are contained in small channels, called 

 portal canals, their immediate investment being a sheath 

 of areolar tissue, called Glisson's capsule. 



26, the vena cava inferior ; 27, opening of the capsular vein ; 28, small 

 part of the trunk of the right hepatic vein ; 29, trunk of the left 

 hepatic vein ; 30, 31, openings of the right and left diaphragmatic veins. 

 * Fig. 85. Longitudinal section of a portal canal, containing a portal 

 vein, hepatic artery and hepatic duct, from the pig (after Kiernan) f . r, 

 branch of vena portse, situated in a portal canal, formed amongst the 

 lobules of the liver, and giving off vaginal branches ; there are also 

 seen within the large portal vein numerous orifices of the smallest inter- 

 lobular veins arising directly from it ; a, hepatic artery ; d, hepatic duct. 



