S8 



ELEMENTARY BIOLOGY. 



[CHAPJ 



i. The hepatic portal vein will now be seen emerging 

 from the head of the pancreas to enter the lef 

 lobe of the liver (cf. § 3); it is formed by th< 

 union of the following factors. 



a. The gastric vein ; bringing back the blood froi 

 the stomach. 



b. The superior mesenteric vein ; a very short vess( 

 running through the head of the pancreas an( 

 receiving 



a. The duodenal veins; bringing in the blooc 

 from the duodenum and pancreas. 



/?. The lieno intestinal vein; formed by the unioi 

 of the ileal from the ileum, the kcemorrhoidal 

 from the large intestine, and the splenic 01 

 lienal from the spleen. 



ii. The coiliaco-7tiesenteric artery may now be traced t( 

 its ultimate distribution. Its origin has beei 

 described at § 9^; it breaks up near the head oi 

 the pancreas into a and b. 



a. The coeliac artery ; distributing branches to th( 

 stomach, liver and pancreas, 



b. The superior mesenteric artery ; supplying the 

 intestine and spleen. The branches of this 

 vessel accompany the factors of the superior 

 mesenteric vein. 



c. The inferior mesenteric artery ; arising from th( 

 dorsal aorta for back and supplying the base oi 

 the large intestine (cf. § 9 d). 



Remove the hinder half of the hip-girdle and the 

 head of the femur. Scrape away the liver to the 



ni. 



