(anatomy) A ringlike band of muscle that surrounds a bodily opening (such as the anus or the openings of the stomach), constricting and relaxing as required for normal physiological functioning.

plural of sphincter

sphincteral

Of or pertaining to the sphincter.

Having a sphincter. / Contracted as if by a sphincter.

(anatomy) The sphincter (= ring muscle) that surrounds the anus (=anal orifice)

(anatomy) Muscular valve connecting the stomach to the duodenum and regulating flow of materials out of the stomach.

(anatomy) The collective muscles used to control the flow of urine from the urinary bladder. These muscles surround the urethra, so that when they contract, the urethra is closed.

plural of pyloric sphincter

plural of anal sphincter