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Walk the Even Hospital Database by book and chapter — the raw source passages that ground Ask, DDx, and the rest.

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contentuptodate· Content· item f14_56_15236

©2013 UpToDate ® Print Email Anal sphincter The anal sphincter is made up of two sets of muscles called the "internal" and "external" sphincters. These muscles form a ring around the anus. When these muscles are working normally, they squeeze the anus shut so that gas and bowel movements cannot leak out.