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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 is one of the major arteries of the alimentary canal it supplies a significant portion of the digestive system including part of transverse colon left colic flexure descending colon sigmoid colon rectum and the upper half of the anal canal