322 



DIGESTION. 



Fig. 83.* 



ToVo" f an i ncn i n 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. 82 JB.). Each lobule is 

 very sparingly invested by areolar tissue. 



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. 83: 



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. 



To take the distribution of the portal vein first : In 

 its course through the liver this vessel gives off small 

 branches, which divide and subdivide between the lobules 



Fig. 83. Longitudinal section of a portal canal, containing a portal 

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

 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. 



