sphincter

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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 ?
The antagonist activity of aripiprazole at 5-HT2A and alfa 1 receptors on detrusor muscle and internal bladder sphincter, respectively, might have contributed to enuresis in our case, although it had no noticeable anticholinergic effects.
So, today, a paralyzed veteran who has incurred the loss of use of both feet together with loss of use of anal and bladder sphincter control may be entitled to SMC as provided by "R-1" based on the loss of use of the lower extremities and the helplessness resulting from the inability to attend to the wants of nature.
Low estrogen levels and other factors can lead to a weak bladder sphincter, resulting in anything from small urine drips to complete emptying of the bladder, usually while sleeping or resting.
Cauda equina syndrome is characterized by lower extremity weakness or paralysis, bowel or bladder sphincter dysfunction, and saddle anesthesia.
Researchers take muscles from the arm and grow primitive muscle stem cells which are injected into the bladder sphincter, taking only 15 minutes under local anaesthetic.