anal sphincter

anal sphincter: anal sphincter n either of two sphincters controlling the closing of the anus:

a) an outer sphincter of striated muscle extending from the coccyx to the central tendinous part of the perineum and surrounding the anus immediately beneath the skin called also external anal sphincter, sphincter ani externus

b) an inner sphincter formed by thickening of the circular smooth muscle of the rectum called also internal anal sphincter, sphincter ani internus

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anal sphincter — noun the sphincter muscle of the anus • Syn: ↑sphincter ani, ↑musculus sphincter ani • Hypernyms: ↑sphincter, ↑anatomical sphincter, ↑sphincter muscle • Part Holonyms: ↑ … Useful english dictionary
Anal sphincter muscles — can refer to:* Sphincter ani externus muscle * Sphincter ani internus muscle … Wikipedia
anal sphincter — noun The sphincter (= ring muscle) that surrounds the anus (=anal orifice) … Wiktionary
anal sphincter external — musculus sphincter ani externus … Medical dictionary
anal sphincter internal — musculus sphincter ani internus … Medical dictionary
external anal sphincter — n ANAL SPHINCTER (a) … Medical dictionary
internal anal sphincter — n ANAL SPHINCTER (b) … Medical dictionary
external anal sphincter — noun see anal sphincter … Useful english dictionary
internal anal sphincter — noun see anal sphincter … Useful english dictionary
sphincter — [ sfɛ̃ktɛr ] n. m. • 1548; mot lat. d o. gr. ♦ Muscle annulaire disposé autour d un orifice naturel qu il resserre et ferme en se contractant. Sphincter de l anus; sphincter anal, vaginal. ● sphincter nom masculin (bas latin sphincter, du grec… … Encyclopédie Universelle

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