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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.
Gas trapped within the left side of transverse colon (near the spleen) can cause splenic-flexure syndrome: 1  upper abdominal bloating, often described as an âunder ribsâ or gastrointestinal chest pain. 2  cramping and strong left upper abdominal pain that can be confused with heart related or pancreatic pain.