#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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