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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.
Radiating branches supplying blood to subdivide the pelvic wall and feed the pelvic organs. 3) the upper gluteal artery (a. 4) the lower gluteal artery (a. 5) The obturator artery (a. obturatoria), which sends its branches to the muscles of the pelvis and thigh, supplying blood hip and ischium.