Inferior mesenteric vein
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Origin and course
The inferior mesenteric vein drains the mesenteric arcade of the hindgut (comprising of distal transverse, descending, and sigmoid colon). Specifically, it drains the tributaries of sigmoid veins, middle and left colic veins, as well as the superior rectal vein. The rectal vein and sigmoid vein usually join to form a common trunk before uniting with the left colic vein.
The inferior mesenteric vein lies left of the inferior mesenteric artery and anterior to the left psoas major muscle, close to the ligament of Trietz. It can cross the left testicular artery or ascend medially to it.
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