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The blood supply to the colon comes from the superior and inferior mesenteric arteries. Part of the rectum is supplied by the internal iliac system and this anastamoses with the lower branches of the inferior mesenteric system.
Inferior mesenteric artery. The inferior mesenteric artery supplies the distal third of the transverse colon, the whole of the descending colon, the sigmoid colon, and the greater part of the rectum. Its branches are the left colic, sigmoid, and superior rectal arteries.