Sphincter
Medical term · S
A ring of muscle that surrounds an opening and can be contracted to close the opening. For example, the muscles found at the anus and the opening of the bladder are sphincters.
Related terms
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BladderThe organ in the pelvis which stores urine before it is passed out through the urethra.
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AnusThe opening of the rectum to the outside of the body.
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Intrinsic sphincter deficiencyInability of the urinary sphincter to close completely.
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pH monitoringA test to determine whether stomach acid is backing up into the esophagus. For this test, a sensing probe is inserted through the nose and positioned above the lower esophageal…