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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.
A lower branch of the superior mesenteric artery; it runs down and to the right to supply blood to the lower portion of the ascending colon and the ileocolic junction. Its inferior branch gives rise to the ascending colic, cecal, appendicular, and ileal arteries.