sphincter

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Related to rectal sphincter: sphincter control

sphincter

Anatomy a ring of muscle surrounding the opening of a hollow organ or body and contracting to close it

Sphincter

 

a ringlike muscle that constricts to close a natural orifice such as the oral or anal opening, or to narrow the passage from one part of a hollow tubular organ to another, for example, from the stomach and bile duct to the duodenum and from the bladder to the urethra. The sphincter is always in a tonic state. The orbicular muscle of the iris is a sphincter. Some sphincters consist of striated muscle and others of smooth muscle innervated by the autonomic nervous system.

sphincter

[′sfiŋk·tər]
(anatomy)
A muscle that surrounds and functions to close an orifice.
References in periodicals archive ?
Construction of a rectal sphincter using the origin of the gluteus maximus muscle.
Construction of rectal sphincter and restoration of anal continence by transplanting the gracilis muscle: A report of four cases in children.
Lavin mentions the repair of three sphincters: internal and external rectal sphincters and the superficial transverse perineal muscle.