[Ruggero Oddi and the discovery of the common bile duct sphincter]

The author gives some information about life in Perugia in the years 1883-87, when Ruggero Oddi was a medical student at the "Libera Università" of Perugia. Moreover the author gives notes about the Hospital and the University in those years with special reference to the situation of the Department of Physiology where the discovery of the sphincter of the common bile duct took place. Then, the author reports the most peculiar facts of Ruggero Oddi's life in a chronological way and finally, he deals with the history of Oddi's discovery of the sphincter of the common bile duct, when he was a student in the fourth year at the "Facoltà di Medicina e Chirurgia" in Perugia.