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
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

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.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

sphincter

[′sfiŋk·tər]
(anatomy)
A muscle that surrounds and functions to close an orifice.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Quantitative analysis of final intraluminal gas volumes, estimated from CT images at the time of image acquisition, would allow more accurate definition of the exact volumes of intracolonic gas at the time of CTC and would negate the effect of losses of gas due to mucosal resorption or sphincteric incompetence.
Medical Center), Karram, and Reynolds explain the surgical management of women with urinary incontinence and specific procedures and interventions for urethral sphincteric incontinence and incontinence resulting from detrusor compliance abnormalities.
The MS presented with trigeminal neuralgia from the outset and this was then followed by pyramidal lower limbs' weakness and sphincteric dysfunction.
It will also allow for reestablishment of the sphincteric action of the pharyngeal wall with approximation of the muscles.
LUTS are experienced by individuals with pathology affecting the lower urinary systemarising from detrusor overactivity, sphincteric weakness, sensory bladder disorders and prostate enlargement, and are generally divided into three groups: storage, voiding and postmicturition symptoms [1].
Urinary incontinence after radical prostatectomy has many causes; the main factor seems to be insufficiency of the sphincteric mechanism and/or bladder abnormalities caused by the anatomical and functional changes during surgery such as direct surgical trauma, neural injury, and decreased elasticity of the bladder neck (3,30).
In LIS group the internal anal sphincter was partially divided, away laterally from fissure mostly on left by making a small radial incision in the inter sphincteric groove, and dividing the internal sphincter under direct vision up to the height of fissure.
Duloxetine for treatment of male sphincteric incontinence following partial conus medullaris infarction after coronary bypass surgery.
(3) It is important to recognize and preserve the functional urethra, which is usually wide in caliber with good sphincteric function and normal verumontanum.
The esophagous alterations some as in other countries are the less frequent but a study with few cases revealed incomplete sphincteric relaxation, which is the most typical manometic finding in Achalasia (Csendes et al.