A sphincter (TA: musculus sphincter) is a term used in anatomy to refer a ring of muscle which narrows a tube or closes off a bodily orifice 1.
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external anal sphincter
internal anal sphincter
hepatic sphincter
ocular sphincter
palatopharyngeal sphincter
precapillary sphincter
preprostatic sphincter
prepyloric sphincter
pyloric sphincter
rectal (Hyrtl) sphincter
rectosigmoid sphincter
sphincter (Boyden) of bile duct
tubal sphincter
urethral sphincter
History and etymology
Sphincter is derived from the Greek word, σφιγγω (sphigo) which was used to refer to a cloak when it was worn tightly bound 1,2.
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