During defaecation, its contraction widens the anal lumen, flattens the anal cushions, shortens the anal canal and everts the anal margin; subsequent relaxation allows the anal cush- ions to distend and thus contribute to an airtight seal.
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- (no access) - McCaskie, A. W._ O'Connell, P. Ronan_ Williams, Norman S - Bailey & Love's Short practice of surgery (2018, CRC Press) - libgen.li.pdf, p1361
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