Biliary dyskinesia Sphincter of Oddi dyskinesia 2013-11-23T02:21:59Z Sphincter of Oddi dysfunction SNOMEDCT_US:430887001 The sphincter of Oddi (also known as sphincter of ampulla) is a muscular valve that controls the flow of bile and pancreatic juice through the ampulla of Vater into the second part of the duodenum. Increased tone of the sphincter or disturbance in the coordination of contraction of the biliary ducts prevents normal emptying of the biliary tree. This may result in biliary pain, common bile duct dilation and episodes of pancreatitis. HP:0012441 UMLS:C4048750 UMLS:C0878588 Reduced motility through the sphincter of Oddi, resulting in impedance of bile and pancreatic juice flow from the common bile duct into the duodenum.