• noun
• synonym
• antonym

• anal sphincter (noun)
  1. the sphincter muscle of the anus
• anatomical sphincter (noun)
  1. a ring of muscle that contracts to close an opening
• bladder sphincter (noun)
  1. the sphincter muscle of the urinary bladder; made up of a thickened muscular layer of bladder around the urethral opening
• cardiac sphincter (noun)
  1. the valve between the distal end of the oesophagus and the stomach; the physiological sphincter at the esophagogastric junction
• musculus sphincter ani (noun)
  1. the sphincter muscle of the anus
• musculus sphincter ani externus (noun)
  1. an external ring of striated muscle surrounding the anus
• musculus sphincter ani internus (noun)
  1. an internal ring of smooth muscle formed by circular fibers of the rectum
• musculus sphincter ductus choledochi (noun)
  1. the smooth muscle sphincter of the common bile duct
• musculus sphincter ductus pancreatici (noun)
  1. the smooth muscle sphincter of the main pancreatic duct
• musculus sphincter pupillae (noun)
  1. a ring of smooth muscle surrounding the iris
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