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sphincter
A specialized ring of muscle that surrounds an orifice. Contractions of the sphincter musculature partially or completely close the orifice.
Specific
anal sphincter
lower esophageal sphincter (LES)
pyloric sphincter
sphincter of Oddi; sphincter of the hepatopancreatic/bilaropancreatic ampulla; Glisson sphincter
sphincter pupillae
urethrovaginal sphincter
General
anatomic structure