musculus sphincter ani

1. The sphincter muscle of the anus (synset 105579344)
   is a type of: anatomical sphincter, sphincter, sphincter muscle - a ring of muscle that contracts to close an opening
   has:

   • musculus sphincter ani externus - an external ring of striated muscle surrounding the anus
   • musculus sphincter ani internus - an internal ring of smooth muscle formed by circular fibers of the rectum
   is a part of: anus - the excretory opening at the end of the alimentary canal
   same as: anal sphincter, sphincter ani

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