Sphincter

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Sphincter Meaning and Definition in Dictionary

Definitions from Wordnet 2.0


  • a ring of muscle that contracts to close an opening

Definitions from Wiktionary


  • a ring of muscle that contracts to close an opening

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Wikipedia Meaning and Definition on 'Sphincter'


  • Sphincter: A sphincter is an anatomical structure, a circular muscle that normally maintains constriction of a natural body passage or orifice and ...
  • Sphincter ani externus muscle: The sphincter ani externus (external anal sphincter) is a flat plane of muscular fibers, elliptical in shape and intimately adherent to the ...
  • Urethral sphincter: The term urethral sphincter refers to one of two muscle s used to control the exit of urine in the urinary bladder through the urethra . ...
  • Iris sphincter muscle: The iris sphincter muscle (pupillary sphincter, pupillary constrictor, circular muscle of iris, circular fibers) is a muscle in the part ...
  • External sphincter muscle of urethra: External sphincter muscle of urethra can refer to: external sphincter muscle of male urethra external sphincter muscle of female urethra ...
  • Sphincter ani internus muscle: The sphincter ani internus (or internal anal sphincter, IAS) is a muscular ring that surrounds about 2.5-4.0 cm of the anal canal ; its ...
  • Sphincter of ampulla: The sphincter of ampulla or sphincter of Oddi is a muscular valve that controls the flow of digestive juices (bile and pancreatic juice) ...
  • Sphincter ani: Sphincter ani can refer to: Sphincter ani externus muscle Sphincter ani internus muscle -
  • Precapillary sphincter: A precapillary sphincter is a band of smooth muscle that adjusts blood flow into capillaries mainly in the mesenteric microcirculation ...

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