The right and left hepatic ducts join together to form the common hepatic duct, which in turn is joined by the cystic duct to form the bile duct in the free border of the lesser omentum. The bile duct then passes behind the first part of the duodenum and the head of the pancreas, joins with the pancreatic duct to form the ampulla of Vater, and opens into the second part of the duodenum on its posteromedial wall on the papilla of Vater.
The papilla is 10 cms distal to the pylorus.
The sphincter of Oddi surrounds the ampulla as well as the ends of the common bile duct and pancreatic ducts.
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