570 



TEXTBOOK OF ZOOLOGY 



The hepatic portal vein is formed by the union of the gastrosplenic, 

 mesenteric, and the ventral abdominal veins. It passes anteriorly and 

 enters the tissue of the liver. The principal branch of the hepatic 

 portal is continued posteriorly as the abdominal vein. The gastro- 

 splenic is a large vessel and lies within the duodenoJiepatic mesentery, 



External ju(]u!ar V. 



^ Internal juqular V- 



Sinus venosus 



J'ulmonary V. 

 _ _^ _ ,^^^y ^.Hepatic V. 



/- ' ' branches in liver 



i HepaUc portal V. 



gastric V. 



-Ventral flMomi'na I V. 



J Renal V. 



I inferior mesentericV 



^^ — Femora] V 



.Sciatic V. 

 — -/.Renal portal V. 

 .Caudal V. 



Fig. 298. — Venous system of horned lizard, ventral view. 



parallel to the pancreas. It receives gastric veins from the stomach 

 and small pancreatic veins. It is formed at its distal end by the 

 union of the splenic and mesenteric veins from the spleen and in- 

 testines. Several separate gastric portal veins take blood directly 

 from the stomach to the liver. 



