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

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

(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 upper esophageal sphincter

plural of lower esophageal sphincter

(anatomy) The sphincter situated at the lower part of the esophagus.

(anatomy) The sphincter situated at the upper part of the esophagus.