Pudendal SSEP documents sensory conduction from dorsal penile or clitoral nerve stimulation to the somatosensory cortex (typical recording at Cz′, 2 cm behind the vertex, referenced to Fz). Diagnostic interpretation relies primarily on P₁ (P40) latency. It is useful in pudendal neuropathy, sphincter dysfunction, and chronic pelvic pain, complementing genitoperineal EMG and the bulbocavernosus reflex (BCR).
Cortical SSEP (pudendal)
| Parameter | Side R | Side L | Diff. R–L | Limit | Result |
|---|
Bulbocavernosus reflex (BCR) — sacral arc S2–S4
Complements pudendal SSEP to distinguish central vs peripheral lesions.
| Parameter | Side R | Side L | Diff. R–L | Limit | Result |
|---|
About pudendal SSEP
The primary parameter is P₁ (P40) latency after genital stimulation. P₁–N₁ amplitude is less reliable in isolation because of technical and anatomical variability. Cavalcanti, Manzano et al. (2007) provides robust normative data in Brazilian women. The bulbocavernosus reflex (Ertekin, Vodusek, Cavalcanti) complements evaluation of the inferior sacral reflex arc.
With Haldeman et al., the full Onset–N₃ series is available; upper limits follow published cutoffs (M + 2 SD or study-specific thresholds).
See also: SSEP median and tibial · SSEP trigeminal · SSEP lateral femoral cutaneous
Clinical support tool only. Does not replace a report from a clinical neurophysiology specialist.