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 ?
In these cases, first of all diagnosis of urethral sphincter injury should be positively made.
A comparative trial of laparoscopic magnetic sphincter augmentation and Nissen fundoplication.
People with GERD have a weakened sphincter which can no longer prevent the harmful reflux of gastric content back into their esophagus and airways.
Conclusion: Anal sphincter injuries formed after vaginal delivery may be one of the reasons that increase the incidence of postmenopausal fecal incontinence and cause the formation of fecal incontinence symptoms in women.
Functions of sphincter are checked by prompting patients to hold, no stress and at evacuation.
The FENIX Continence Restoration System is designed to treat FI by restoring the barrier function of the anal sphincter muscle.
sup][5],[20] A 3 [sup]rd -degree perineal tear is defined as a partial or complete disruption of the anal sphincter muscles, which may involve either or both the external anal sphincter (EAS) and internal anal sphincter (IAS) muscles.
A failed repair was considered present when there was wound dehiscence, sphincter disruption, rectovaginal fistula, and/or faecal incontinence.
Loperamide, the drug most extensively studied for this purpose, has been found to increase resting anal pressure and improve anal sphincter function and continence by acting directly on the circular and longitudinal muscles of the bowel.
12] In a review, Venn et al analyzed the outcome of 100 patients in whom an artificial urinary sphincter was implanted for more than 10 years ago.
BID for internal urethral sphincter relaxation and Bethanechol, a detrusor contracting agent @ 2mg/kg b.