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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.
Splenic flexure syndrome refers to a digestive condition which causes spasm of the splenic flexure occurring in the colon. Trapping of gas is what leads to the spasm. The abdominal pain and discomfort that is endured is debilitating and intense and can be compared to that experienced during a cardiac arrest.