[In-vitro motility studies on the strips of the canine gallbladder (author's transl)].

In-vitro motility of the gallbladder was investigated in the circularly cut full thickness strips obtained from 19 mongrel dogs. The present study was undertaken to determine an appropriate size of the strips for observation and to know any difference, if exists, between motilities of the strips prepared from the neck, body and fundus. Recordings were made on a pen chart recorder using an isometric tension system. The results obtained were as follows. 1) The most appropriate size of the specimens to examine the changes of contractile dynamics was 5 mm in width and 15 mm in length. 2) The strips from three parts of the gallbladder showed similar rhythmic and tonic spontaneous contraction patterns.