Abstract
We have been evaluating a colic motility with extrasomatic ultrasonography, it is called water sealed method (WSM) . It was able to evaluate colic motility from the cecum to the decending colon. In the right colon, it was strong relation between peristalsis contractions and migration of the intestinal contents. But in the colon from the transverse colon to the descending colon, the relation between peristalsis contractions and migration of the intestinal contents was not clear. Therefore the right colon would have'active transit function'. This time we would like to evaluate with WSM and colonoscope how right colon has peristalsis contractions. In the examination with WSM the active peristalsis contraction of the right colon started at the cecum toward hepatic flexure. Tension of the crescentic folds and hausta, and relaxation of the cecum were important factors for the peristalsis contractions. On the other hand, in the examination with colonoscope segments in the right colon divided by the crescentic folds were compressed serially from the cecum toward hepatic flexure. In other words the right colon has active peristalsis contractions like the cornice, and the contractions like the small intestine were not observed at all. Three important factors were as follows.
1) the crescentic folds make septums in the right colon sufficiently.
2) segment internal pressure is kept by tension of the intestinal wall.
3) the segments were compressed serially from cecum toward hepatic flexure.
