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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 first unpaired midline artery branching from the abdominal aorta. It supplies blood to the foregut, i.e., the stomach, liver, spleen, pancreas, and proximal half of the duodenum. The celiac artery is short and wide; its branches include the left gastric, the splenic, and the common hepatic arteries.