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 cylindrical muscle that normally maintains constriction of a natural body passage or orifice and which relaxes
  • Sphincter of oddi: The sphincter of Oddi (or hepatopancreatic sphincter) is a muscular valve that controls the flow of digestive juices (bile and pancreatic juice) through
  • 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
  • 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 integument
  • External sphincter muscle of female urethra: external sphincter muscle of female urethra is a muscle which controls urination in women. The terms "urethrovaginal sphincter" ("sphincter urethrovaginalis")
  • 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
  • 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
  • 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
  • Stephen Sphincter: Stephen Sphincter was an early Gwar character, played by Ron Curry, who recorded six albums on SST Records with Hotel X. His on-stage brother was Hans

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