[The initiation and propagation of canine pelviureteral contraction studied through visual observation and simultaneous electromyographic recording (author's transl)].

The initiation and the propagation of the ureteral peristalsis were studied through the visual observation and the simultaneous recording of action potentials at both renal pelvis and ureter. The results were summarized as follows: 1) The contraction waves were seen to arise at the proximal end of the renal pelvis. Each wave moved from its origin across the adjacent part of the renal pelvis toward the pelviureteric junction forming a crescentric wave front centering the pelviureteric junction. But some waves failed to propagate not only at the pelviureteric junction but also within the renal pelvis. 2) By electromyographic study, pacemaker potentials were recorded clearly at the proximal end of the pelvis and the interval of the discharge was constant throughout the recording period. Some of the electrical waves failed to conduct within the renal pelvis as well as at the pelviureteric junction.