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 some patients after Hemorrhoidectomy, sphincter injury can occur.
Despite success with slings in a select group of patients, i.e., those with low preoperative pad weights, appropriate external sphincter coaptation on preoperative cystoscopy, and no history of prior radiation or urethral surgery, there are many patients who do not fit these criteria and are better served with AUS.
The magnetic attraction between the beads augments the existing esophageal sphincter's barrier function to prevent reflux.
When an anatomic defect is present in the anal sphincter and conservative treatment has not been successful, surgical correction is preferred.
[15] in their study on twins though found no significant difference in preprandial BLESP in symptomatic versus asymptomatic subjects but found significantly lower postprandial BLESP in symptomatic versus asymptomatic twins with no difference in peristaltic amplitude, LES length, or transient lower esophageal sphincter relaxation (tLESR).
Slowly absorbable or nonabsorbable sutures were considered appropriate for sphincter repair.
(31) Therapy generally has 3 components: exercising the external sphincter complex, training in the discrimination of rectal sensations, and developing synchrony of the internal and external sphincter responses during rectal distension.
These functions are performed by coordinated actions between the detrusor and the urethral sphincter under the control of brain and lumbosacral spinal cord (Groat et al., 1993).
Nevertheless they were able to induce regeneration of the mouse's own urethral sphincter muscle."
But now, according to Professor Khalil Bitar, one of the lead researchers involved in the work mentioned above, "In essence, we have built a replacement sphincter that we hope can one day benefit human patients.
Obstetrical anal sphincter laceration is a known risk factor for AI.