Abstract
Studies were made on the duodenum and the ductus choledochus of a total of 125 Japanese. Results of those studies revealed that the opening of ductus hepatopancreatica on the papilla duodeni major by a single hole was recognized in 95.0 ± 2.18%, while that by two holes in 5.0 ± 2.18 %. Mean length of the ductus choledochus was 64.7 mm of which pars intramuralis was 12.4 mm in an average.
Vater's diverticulum is the termination in common between the ductus choledochus and the ductus pancreaticus major. Those who possess Vater's diverticulum on the joint of the ductus choledochus and the ductus pancreaticus major were 92.0 ± 2.71 % and those who do not possess the diverticulum in spite of the combination of those two ducts were 4.0 ± 1.96 %, while those in which each of the two ducts opens separately on the papilla duodeni major were 4.0 ± 1.96%.
In inside of Vater's diverticulum, the wall separating the opening of the two ducts presents a form of bicuspid or monocuspid mucous membrane valve closing one side of the opening at a time.
