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[The expelling mechanism of bile into the duodenum (author's transl)].

Guinea-pigs,rabbits, cats and rats were used in this experiment and the following conclusion was obtained. The pars intestinalis of the common bile duct was surrounded by the circular and longitudinal muscle fibers which were ramified from the same layer of the duodenum . There are no specialized or locarized fibers as described by Oddi . When the intraluminal pressure in the common bile duct overcame the resistance of the pars intestinalis by the contraction of gall-bladder or duodenum , bile was forced to expel into the duodenum, but some amount of bile was pushed back into the common bile duct even into the gallbladder. Intraluminal pressure in the common bile duct plays a most important role in the bile expelling mechanism.