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 a circular muscle that normally maintains constriction of a natural body passage or orifice and which relaxes as required by normal physiological
  • Internal sphincter muscle of urethra: The internal sphincter muscle of urethra is a urethral sphincter muscle which constricts the internal urethral orifice. It is the junction of the urethra
  • External sphincter muscle of female urethra: external sphincter muscle of female urethra is a muscle which controls urination in females. The terms "urethrovaginal sphincter" ("sphincter urethrovaginalis")
  • Urethral sphincter: urethral sphincter and the internal urethral sphincter. When either of these muscles contracts, the urethra is sealed shut. The external urethral sphincter originates
  • External anal sphincter: The external anal sphincter (or sphincter ani externus ) is a flat plane of muscular fibers, elliptical in shape and intimately adherent to the skin surrounding
  • Internal anal sphincter: The internal anal sphincter, IAS, (or sphincter ani internus) is a muscular ring that surrounds about 2.5–4.0 cm of the anal canal; its inferior border
  • Iris sphincter muscle: The iris sphincter muscle (pupillary sphincter, pupillary constrictor, circular muscle of iris, circular fibers) is a muscle in the part of the eye called
  • Anal sphincter muscles: Anal sphincter muscles may refer to: External anal sphincter Internal anal sphincter
  • Sphincter of Oddi: The sphincter of Oddi (or hepatopancreatic sphincter), abbreviated as SO, is a muscular valve that controls the flow of digestive juices (bile and pancreatic

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