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sphincter ani |
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sphincter ani, a double set of circular muscles at the opening of the anus. One, the sphincter ani internus, consists of a thickened inner circular coat of the bowel smooth muscle; the other, the sphincter ani externus, is a flat sheet of striated voluntary muscle surrounding the anal orifice. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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