Citation, DOI, disclosures and article data
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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.
external anal sphincter
internal anal sphincter
rectal (Hyrtl) sphincter
sphincter (Boyden) of bile duct
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.
- 1. William Alexander Newman Dorland. Dorland's Illustrated Medical Dictionary. (2007) ISBN: 9781416023647 - Google Books
- 2. James Diggle. The Cambridge Greek Lexicon. (2021) ISBN: 9781108836982 - Google Books