(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.

Of or pertaining to the sphincter.

sphincteral

plural of sphincter

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

plural of pyloric sphincter

(anatomy) A muscular valve that controls the flow of digestive juices (bile and pancreatic juice) through the ampulla of Vater into the second part of the duodenum.

plural of anal sphincter

(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.

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