The author developed a new electromyography of the detrusor muscle which is applicable also for clinical examinations and obtained the following results:
1. In the normal bladder no action potential appeared when the organ was not full yet.
2. When the intravesical pressure was raised by introducing saline into trie bladder, spikes appeared.
3. Spikes of high frequency appeared with the onset of voiding.
4. In the normal bladder no action potential appeared by administration of 5 to 7 mg mecholyl.
5. From some muscles of the dome of the bladder was obtained spontaneous spike potential consisting of spike burst of about 10 spikes. In an animal experiment using adult dogs the spikes of the simple type appeared. The discharge interval was about 5 seconds.
6. In the bladder with damaged peripheral nerve, spikes appeared during veridical quiescence.
7. In the bladder with damaged peripheral nerve, spikes of high frequency appeared by administration of 5 to 7 mg mecholyl.
