anal sphincter

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anal sphincter

[′ān·əl ′sfiŋk·tər]
(anatomy)
Either of two muscles, one voluntary and the other involuntary, controlling closing of the anus in vertebrates.
References in periodicals archive ?
The technique for repairing obstetrical anal sphincter lacerations has traditionally been the end-to-end repair technique, but this is associated with up to a 50% rate of disrupted external anal sphincter and/or fecal incontinence.
The external anal sphincter is then mobilized and an overlapping repair is done.
The lesion appeared to originate from between the internal and external anal sphincters, with the superior part of the lesion therefore lying in the intersphincteric plane and the lower part bulging out into the perineum.

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