Serial histotopographic sections of the greater duodenal papilla area have been studied to clarify the way of formation of the hepatic-pancreatic ampulla and the intramural part of the common bile and pancreatic ducts. In predominant cases in the longitudinal fold of the duodenum the common bile and pancreatic ducts are fused and form a common hepatic-pancreatic ampulla, which opens with an orifice at the apex of the large papilla of the duodenum (papilla fatera). The shape of the ampulla cavity depends on the level of fusion of the aforementioned ducts.

Hepatic-pancreatic ampulla, mode of formation, morphology.

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