Dynamics of the ureterovesical junction: its fluid transport mechanism in the pig

The peristaltic fluid transport mechanism of the ureterovesical junction was investigated with distal and juxtavesical ureteral perfusion pressure measurements. Elimination of the activity of the juxtavesical ureteral segment, juxtavesical or intravesical partial resection of the ureteral sheaths, and impediment of shortening of the muscular layers of the ureterovesical junction ureter segment, all reduced the effectiveness of ureterovesical junction peristalsis. From these findings and from the anatomy of the ureterovesical junction we concluded that peristaltic urine transport through the ureterovesical junction is effectuated by shortening and telescoping of the muscular layers of the ureterovesical junction ureter segment and its sheaths into each other and into the ureteric hiatus.