1983 Volume 74 Issue 6 Pages 961-966
Urodynamic examination and horseradish peroxidase (HRP) study were employed to investigate the action of the pelvic efferent neurons, which innervate the urinary bladder, on the external urethral sphincter. In seven of fifteen dogs the external urethral sphincter still continued to discharge impulses after the bilateral pudendal nerves were cut, and electromyograms, disappeared at last on addition of cutting off the bilateral pelvic nerves. Following HRP injection into the proximal section of the pelvic nerve, labeled neurons were found in the cell group of Onuf, in three of five dogs, as well as in the intermediolateral and intermediomedial cell columns of the sacral segments.
