anatomical sphincter

1. A ring of muscle that contracts to close an opening (synset 105578470)
   is a type of: muscle, musculus - one of the contractile organs of the body
   subtypes:

   • physiological sphincter - a sphincter that is not recognizable at autopsy because its resting arrangement cannot be distinguished from adjacent tissue
   • anal sphincter, musculus sphincter ani, sphincter ani - the sphincter muscle of the anus
   • musculus sphincter urethrae, urethral sphincter - a striated sphincter muscle that constricts the urethra
   • bladder sphincter, musculus sphincter vesicae - the sphincter muscle of the urinary bladder; made up of a thickened muscular layer of bladder around the urethral opening
   • musculus sphincter ductus choledochi - the smooth muscle sphincter of the common bile duct
   • musculus sphincter ductus pancreatici - the smooth muscle sphincter of the main pancreatic duct
   • musculus sphincter pupillae, pupillary sphincter - a ring of smooth muscle surrounding the iris
   • musculus sphincter pylori, pyloric sphincter, pyloric valve - the sphincter muscle of the pylorus that separates the stomach from the duodenum
   same as: sphincter, sphincter muscle

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