sphincter

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Related to Upper esophageal sphincter: lower esophageal sphincter

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 ?
Alteration of the upper esophageal sphincter belch reflex in patients with achalasia.
Globus sensation is associated with hypertensive upper esophageal sphincter but not with gastroesophageal reflux.
The patient underwent bougie (60 French Maloney) dilation of the upper esophageal sphincter.
Manometry of the upper esophageal sphincter revealed a high resting pressure (160 mm Hg) with poor relaxation (residual pressure: 20 mm Hg).

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