internal sphincter of urethra

sphincter /sphinc·ter/ (sfingk´ter) [L.] a ringlike muscle which closes a natural orifice or passage.sphinc´teralsphincter´ic

anal sphincter , sphincter a´ni sphincter muscle of anus (external or internal).

cardiac sphincter , cardioesophageal sphincter muscle fibers about the opening of the esophagus into the stomach.

external sphincter of female urethra external sphincter muscle of female urethra.

external sphincter of male urethra external sphincter muscle of male urethra.

gastroesophageal sphincter the terminal few centimeters of the esophagus, which prevents reflux of gastric contents into the esophagus.

hepatic sphincter a thickened portion of the muscular coat of the hepatic veins near their entrance into the inferior vena cava.

internal sphincter of urethra internal sphincter muscle of urethra.

O'Beirne's sphincter a band of muscle at the junction of the sigmoid colon and rectum.

sphincter of Oddi the sheath of muscle fibers investing the associated bile and pancreatic passages as they traverse the wall of the duodenum.

pharyngoesophageal sphincter a region of higher muscular tone at the junction of the pharynx and esophagus, which is involved in movements of swallowing.

precapillary sphincter a smooth muscle fiber encircling a true capillary where it originates from the arterial capillary, which can open and close the capillary entrance.

pyloric sphincter see under muscle.

rectal sphincter an incomplete band or thickening of the muscle fibers in the rectum a few inches above the anus in the upper part of the rectal ampulla.

tubal sphincter an encircling band of muscle fibers at the junction of the uterine tube and the uterus.

vesical sphincter internal sphincter muscle of urethra.

sphinc·ter (sf

ngk

A ringlike muscle that normally maintains constriction of a body passage or orifice and that relaxes as required by normal physiological functioning. Also called anatomical sphincter.

sphincter·al, sphinc·teric (-t

k) adj.

Sphincter

A circular band of muscle that surrounds and encloses an opening to the body or to one of its hollow organs. Damage to the sphincter surrounding the anus can cause fecal incontinence.

Mentioned in: Cystometry, External Sphincter Electromyography, Fecal Incontinence, Neurogenic Bladder, Overactive Bladder, Paruresis

sphincter

[sfingk′tər]

Etymology: Gk, sphingein, to bind

a circular band of muscle fibers that constricts a passage or closes a natural opening in the body, such as the hepatic sphincter in the muscular coat of the hepatic veins near their union with the superior vena cava, and the external anal sphincter, which closes the anus.

sphincter [sfingk´ter]

a circular muscle that constricts a passage or closes a natural orifice. When relaxed, a sphincter allows materials to pass through the opening. When contracted, it closes the opening. Four main sphincter muscles along the alimentary canal aid in digestion: the cardiac sphincter, the pyloric sphincter, and two anal sphincters. Other sphincters are found in the iris of the eye, the bile duct (sphincter of Oddi), the urinary tract, and elsewhere.

anal sphincter (sphincter a´ni) either of two sphincters (the internal and external anal sphincters) that open and close to control evacuation of feces from the anus.

cardiac sphincter a sphincter between the esophagus and the stomach, opening at the approach of food that can then be swept into the stomach by rhythmic peristaltic waves.

sphincter of Oddi a sheath of muscle fibers investing the associated bile and pancreatic passages as they traverse the wall of the duodenum.

pyloric sphincter a sphincter at the opening from the stomach into the duodenum; it is usually closed, opening only for a moment when a peristaltic wave passes over it.

urinary sphincter, artificial a fluid-filled system that surrounds the urethra with a silicone cuff that functions as a sphincter; a pump is in the scrotum and a fluid reservoir is in the abdomen. For urination, the pump's release valve is squeezed to allow the fluid to leave the urethral cuff and return to the reservoir; after urination is complete, the pump is squeezed and the fluid returns to the cuff to occlude the urethra.

sphincter (sfingk´t

r),

n a circular band of muscle fibers that constricts a passage or closes a natural opening in the body.

sphincter

a circular muscle that constricts a passage or closes a natural orifice. When relaxed, a sphincter allows materials to pass through the opening. When contracted, it closes the opening. The principal abnormalities relate to function. Failure to open may be because of spasm or achalasia, due usually to failure of parasympathetic nerve supply. Failure to close usually due to absence of sympathetic nerve supply. The important sphincters are the anal, ileal, pharyngoesophageal, pupillary, pyloric, reticulo-omasal, teat, urethral, vaginal and vesical.

cardiac sphincter

the functional sphincter at the gastric end of the esophagus.

sphincter control

is by the autonomic nervous system.

esophageal sphincter

see cardiac sphincter.

sphincter of Oddi

bile duct sphincter.

pupillary sphincter

a ring of smooth muscle around the pupillary border of the iris.

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achalasia anal sphincter articular muscle cardiac muscle cardiac sphincter deltoid muscle detrusor-sphincter dyssynergia Esophageal sphincter External Sphincter Electromyography external sphincter of female urethra external sphincter of male urethra extrinsic muscle fecal incontinence involuntary muscle micturition muscle mylohyoid muscle oddi sphincter pyloric sphincter			internal locus of control internal malleolus internal mammary artery internal mammary artery bypass internal mammary node internal medicine internal obturator muscle internal occipital crest internal ophthalmopathy internal ophthalmoplegia internal os internal phase internal podalic version and total breech extraction internal pterygoid muscle internal pudendal artery internal pudendal vein internal radiation therapy internal respiration internal respiratory nerve of Bell internal rotation internal secretion Internal Snapping Hip Syndrome internal spermatic artery internal sphincter muscle of anus internal sphincter muscle of urethra internal sphincter of urethra internal standard internal strabismus internal strangulation internal thoracic artery internal thoracic vein internal traction internal urethral opening internal version internalization internalize internally Internally Displaced Person internasal suture internatal International Association for Dental Research International Association for Enterostomal Therapy International classification of disease codes International Classification of Diseases International Commission on Radiation Protection International Committee on Veterinary Anatomical Nomenclature International Council of Nurses International Dental Hygienists' Federation International Elbow Working Group (IEWG) International Federation of Competitive Eating International Fragrance Association			Internal Server Error Internal Service Request Internal Shorted Patch Antenna Internal Silencer Internal sin Internal Skeletal Fixation System Internal Snapping Hip Syndrome Internal Software Problem Reports Internal Software Specification Review Internal sort internal sorting Internal space design Internal space design Internal Spanning Tree Internal Special Investigations Office Internal Specification Internal Specifications Maintenance Internal Spectral Shifter and Energy Converter Internal Speed Expansion Internal spermatic Internal spermatic Internal spermatic arteries Internal spermatic arteries internal spermatic artery internal spermatic artery Internal spermatic vessels Internal spermatic vessels internal sphincter muscle of anus internal sphincter muscle of urethra internal sphincter of urethra Internal spore Internal spore Internal spore internal spring safety relief valve Internal Stability Division Internal Stability Unit Internal Stable Globalization internal stack failure Internal standard Internal standard Internal standard Internal Standard Operating Procedure Internal State Reversion Internal State Variable Internal Stop internal storage internal storage capacity internal strabismus internal strangulation internal stress Internal Substance Abuse Program Internal Superior Laryngeal Nerve internal suspension wire internal suspension wire internal suspension wire Internal Symbol Dictionary Internal System for Movement Restoration Internal System Requirements Review Internal Systems Administrator internal table

sphincter (redirected from internal sphincter of urethra)

sphincter
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