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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.
The colon is supplied by the superior mesenteric artery through its right colic and middle colic branches and by the inferior mesenteric artery through its left colic and multiple sigmoid branches. The terminal branches of these arteries entering the colonic wall are called vasa recta.