254 Portal Vein. 



606. The Ramifications in the Liver of the Portal 

 Vein of a Child. 



After a specimen of Ilyrtl. y, natural size. 



c) The inferior mesenteric vein, whose branches correspond 

 to those of the inferior mesenteric artery, and which usually empties 

 into the splenic vein (s. Fig. G05). 



d) The splenic vein, which runs along the upper border of 

 the pancreas, and opens into the portal vein. 



The branches of origin of the portal vein unite behind the head 

 of the pancreas to form the Truncus venae portae, which receives the 

 1". gastro-epiploica and the 1". cy*ti<1is feUcae. 



The ramifications of t h e portal v e i n in the liver arise 

 from two brandies and, in the lobes of the liver, pass on into the 

 capillaries. 



The circulation of the foetal system is shown in Fig. 607. In 

 it, the arterial blood (T. umbilicalis) is marked by transverse lines, the 

 venous blood system of the two Venae cavae by longitudinal lines, 

 the mixed blood, which circulates everywhere in the foetus, by lines 

 crossing each other. The direction of the current of the blood is shown 

 by the arrows. 



