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Function of the pelvic floor and anal sphincters during defaecation. The coordinated relaxation of the pelvic floor and anal sphincters, together with propulsion of content in the distal colon and raised intra-abdominal pressure during straining allow the straightening of the recto-anal angle and comfortable, unimpeded evacuation of stool. Reproduced from Lembo T, Camilleri M.1
