[TA] the smooth muscle sphincter of the hepatopancreatic ampulla within the major duodenal papilla. SYN: musculus sphincter ampullae hepatopancreaticae [TA], musculus sphincter ampullae biliaropancreaticae*, musculus sphincter ampullae*, sphincter of ampulla*, sphincter of biliaropancreatic ampulla*, Glisson sphincter, hepatopancreatic sphincter, Oddi sphincter.