Inferior mesenteric vein is a tributary of portal circulation that drains blood from the large intestine.
Origin, course and termination:
Inferior mesenteric vein begins halfway down the anal canal as the superior rectal vein. Then it passes up the posterior abdominal wall on the left side of the inferior mesenteric artery and the duodenojejunal flexure. It ends by joining the splenic vein behind the pancreas.
The inferior mesenteric vein receives tributaries corresponding to the branches of inferior mesenteric artery, which include left colic vein, sigmoid veins and superior rectal vein.