THE PORTAL SYSTEM OF VEINS 



755 



to the caudate and Spigelian lobes, and then enters the left lobe of the liver. As 

 it crosses the longitudinal fissure it is joined in front by a fibrous cord, the liga- 

 mentum teres of the liver or impervious umbilical vein, and is united to the inferior 

 vena cava by a second fibrous cord, the ligamentum venosum or impervious 

 dutcus venosus. 



The tributaries of the portal vein are: 



Splenic. 



Superior mesenteric. 



Gastric. 



Pyloric. 



Cystic. 



Parumbilical. 



FIG. 529. Portal vein and its branches. 



NOTE. In this diagram the right gastroepiploic vein opens into the splenic vein; general!)' 

 it empties itself into the superior mesenteric. close to its termination. 



The splenic vein (v. lienalis) (Fig. 529) commences by five or six large branches 

 which return the blood from the substance of the spleen. These, uniting, form a 



