#anal_sphincter__sphincter_ani__sphincterani__musculus_sphincter_ani the sphincter muscle of the anus
supertype: anatomical_sphincter__sphincter__sphinctermuscle a ring of muscle that contracts to close an opening
part of: anus
part: musculus_sphincter_ani_externus an external ring of striated muscle surrounding the anus
part: musculus_sphincter_ani_internus an internal ring of smooth muscle formed by circular fibers of the rectum
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