Cortical evoked responses from the perineal nerve

Area of Science:

• Neuroscience
• Urology
• Physiology

Background:

• Understanding the neural pathways involved in male sexual function is crucial.
• The perineal nerve's role in ejaculation and erection requires further elucidation.
• Establishing normal electrophysiological parameters is essential for diagnosing dysfunction.

Purpose of the Study:

• To characterize and determine normal reference latencies for the cortical evoked response originating from the perineal nerve.
• To investigate the independence of this neural pathway from the dorsal nerve of the penis.

Main Methods:

• Electrophysiological testing was performed on 15 healthy adult males.
• Stimulation of the perineal nerve was applied at the ventral base of the penis and perineal floor.
• Cortical evoked responses were recorded, measuring onset latencies before and after dorsal penile nerve anesthesia.

Main Results:

• A consistent cortical evoked response was elicited from the perineal nerve at the ventral penis (mean latency: 48.4 ms).
• Anesthesia of the dorsal nerve of the penis did not affect the response.
• Similar responses were observed, though less consistently, from perineal floor stimulation.

Conclusions:

• A reliable cortical evoked response can be obtained from the perineal nerve at the ventral penis.
• This pathway is independent of the dorsal nerve of the penis.
• Perineal somatic innervation studies may be vital for understanding ejaculatory and erectile dysfunction.