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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.
Celiac Artery (Celiac Trunk). The celiac artery (or the celiac trunk) provides oxygenated blood to the foregut: it supplies blood to the stomach, the liver, the spleen and the part of the esophagus that reaches into the abdomen.