220 NORMAL HISTOLOGY AND ORGANOGRAPHY. 



The Portal Canal. This consists of an artery, 

 bile duct, and a vein, with accompanying lymphatics 

 and connective tissue. Sections of the portal canal 

 may be found between the liver lobules where the 

 vessels are small, or between the liver lobes where the 

 structures are large. The bile duct can be recog- 

 nized by the columnar simple epithelium and the 

 artery and vein by their respective histology. In 





Fig. 166. Reticulum (Gitterfasern) of dog's liver (gold-chlorid method) 

 (Bohm and Davidoff). 



pathological sections, where the lobules can no 

 longer be recognized, the portal canal usually re- 

 mains patent and is therefore a valuable criterion 

 in the identification of this tissue. 



The common bile duct is formed by the junction of 

 the hepatic and cystic ducts at the mouth of the 

 transverse fissure, and passes downward anterior to 



