The termination of the common bile duct.
D014670:Ampulla of Vater / Q000002:abnormalities; D001660:Biliary Tract Diseases; D002758:Cholangiography; D003135:Common Bile Duct / Q000002:abnormalities* / Q000601:surgery; D004386:Duodenum / Q000601:surgery; D006801:Humans