Electrophysiological exploration of the sacral conus.

Evoked urethral and anal responses are produced by electrical stimulation of penis, bladder neck and anus. Latency and duration of the responses after bladder neck and anal stimulation are greatly dependent on stimulus parameters, suggesting a polysynaptic reflex; penile stimulation probably involves an oligosynaptic pathway. In pathological conditions the responses are delayed and their duration reduced.