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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.
Many major arteries branch from the abdominal aorta to provide blood flow to the vital organs of the abdomen. Its visceral branches provide blood to organs, while its parietal branches supply blood to the tissues of the abdominal body wall. The celiac trunk is a visceral artery that splits from the abdominal aorta below the inferior phrenic artery. 2  It branches almost immediately into the left gastric, splenic, and common hepatic arteries. 3  These arteries provide blood to the stomach, spleen, and liver.