The choledochal sphincter, which is often referred to as the sphincter of Boyden, is a sphincter that is situated in the common bile duct just before it meets the pancreatic duct to create the ampulla of Vater.
This sphincter aids in the filling of the gallbladder with bile and regulates the passage of bile into the pancreatic duct.
The bile flow from the liver to the duodenum is controlled by it, which is divided into the superior and inferior sphincters.