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Definition of Sphincter
1. Noun. A ring of muscle that contracts to close an opening.
Generic synonyms: Muscle, Musculus
Specialized synonyms: Physiological Sphincter, Anal Sphincter, Musculus Sphincter Ani, Sphincter Ani, Musculus Sphincter Urethrae, Urethral Sphincter, Bladder Sphincter, Musculus Sphincter Vesicae, Musculus Sphincter Ductus Choledochi, Musculus Sphincter Ductus Pancreatici, Musculus Sphincter Pupillae, Pupillary Sphincter, Musculus Sphincter Pylori, Pyloric Sphincter, Pyloric Valve
Definition of Sphincter
1. n. A muscle which surrounds, and by its contraction tends to close, a natural opening; as, the sphincter of the bladder.
2. a. Of, pertaining to, or designating, a sphincter; as, a sphincter muscle.
Definition of Sphincter
1. Noun. (anatomy) A ringlike band of muscle that surrounds a bodily opening, constricting and relaxing as required for normal physiological functioning. ¹
¹ Source: wiktionary.com
Definition of Sphincter
1. [n -S]
Medical Definition of Sphincter
1.
Lexicographical Neighbors of Sphincter
Literary usage of Sphincter
Below you will find example usage of this term as found in modern and/or classical literature:
1. Surgery, Gynecology & Obstetrics by The American College of Surgeons, Franklin H. Martin Memorial Foundation (1921)
"The sphincter, on the contrary, keeps the bladder closed while it is filling ...
The term ''internal sphincter" is applied to all the smooth circular ..."
2. Anatomy, Descriptive and Applied by Henry Gray (1913)
"The sphincter ani externus (External sphincter ani) (Fig 513) is a flat plane of
... The deeper portion forms a complete sphincter to the anal canal. ..."
3. Anatomy, Descriptive and Surgical by Henry Gray (1901)
"The sphincter vaginae surrounds the orifice of the vagina, and is analogous to
the Accelerator urime in the male. It is attached posteriorly to the central ..."
4. Physiology and Biochemistry in Modern Medicine by John James Rickard Macleod (1922)
"of the duodenum occurs a short time after the commencement of the sphincter
contraction. Superimposed upon the duodenal peristaltic waves are rhythmical ..."
5. American Journal of Roentgenology by American Radium Society (1921)
"From the above it follows that in order for the stimulation of acid in the stomach
to open, and in the duodenum to close the sphincter, there must be ..."
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