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Anatomy
containing
Anal Sphincter
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in specified order only
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external
anal sphincter
肛门外括约肌
(位于肛门周围,肛门内括约肌的外下方,按位置分为皮下部、浅部和深部,浅部和深部有较强的括约肛门作用。肛门外括约肌受肛神经支配)
internal
anal sphincter
肛门内括约肌
(由肛管下部环行平滑肌增厚而成,有协助排便的作用,但几乎无括约肛门的功能)
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