#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:  musculus_sphincter_ani_externus  musculus_sphincter_ani_internus
  part of:  anus__arse__arsehole__asshole  excretory opening at the end of the alimentary canal
     part of:  rectum  the terminal section of the alimentary canal; from the sigmoid flexure to the anus
        part of:  large_intestine__largeintestine  beginning with the cecum and ending with the rectum; includes the cecum and the colon and the rectum; extracts moisture from food residues which are later excreted as feces
           part of:  alimentary_canal__alimentary_tract__digestive_tube__digestivetube__digestivetract__gastrointestinal_tract__GI_tract  tubular passage of mucous membrane and muscle extending about 8.3 meters from mouth to anus; functions in digestion and elimination
              part of:  digestive_system__digestivesystem__gastrointestinal_system__systema_alimentarium__systemaalimentarium__systema_digestorium__systemadigestorium  the system that makes food absorbable into the body
                 part of:  body__organic_structure__organicstructure__physical_structure  the entire physical structure of an organism (especially an animal or human being); "he felt as if his whole body were on fire"

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