musculus sphincter ani externus

(redirected from External anal sphincter muscle)
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Related to External anal sphincter muscle: External urethral sphincter, Sphincter ani externus muscle
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Noun1.musculus sphincter ani externus - an external ring of striated muscle surrounding the anus
skeletal muscle, striated muscle - a muscle that is connected at either or both ends to a bone and so move parts of the skeleton; a muscle that is characterized by transverse stripes
anal sphincter, musculus sphincter ani, sphincter ani - the sphincter muscle of the anus
References in periodicals archive ?
Often, obstetricians try to ensure that the knots are buried within the body of the external anal sphincter muscle, rather than on the surface of the fascial sheath of the sphincter.
The term "anismus" is used to describe obstructed defecation that may be caused by inappropriate contraction or nonrelaxation of the pelvic floor, although its cause is unknown.[41] Wasserman[42] described a condition that he termed puborectalis syndrome, consisting of "a type of stenosis of anorectum caused by a spasm of a component of the external anal sphincter muscle." This syndrome also is referred to as rectal dyschezia,[43] paradoxical EAS,[44] spastic pelvic floor syndrome,[45] rectoanal dyssynergia,[46] abdominoelevator incoordination,[47] immobile perineum[48] and abdominopelvic anachronism.[49] The primary symptom reported by patients with anismus is obstructed defecation.
Located between the internal and external anal sphincter muscles, and lined with oil and sweat glands, each anal sac is connected to the outside world via a short, narrow duct.

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