Somatosensory Evoked Potentials Recorded from the Neck and Scalp Following Median Nerve Stimulation in Normal Man

KOIKE Hidemi, YOSHINO Yoshikazu, MIKI Seiko, SEKI Hiroko, MURANAKA Takuma

doi:10.11434/kyorinmed.13.481

Somatosensory evoked potentials (SEPs) were recorded from sites overlying the 7th cervical vertebra, Erb's point and the scalp, following percutaneous stimulation of the median nerve at the wrist in 53 normal subjects. SEPs recorded from the scalp (reference : earlobe) consisted of P15 (peak latency 12.6±1.1ms), N20 (17.1±1.0), P25 (21.7±1.9), N35 (29.2±2.6), P45 (40.0±3.5) and N55 (57.4±6.6) in order. Peak-to-peak amplitudes of these components were as follows, P15-N20 (2.9±1.0μV), N20-P25 (4.1±1.8), P25-N35 (3.5±2.5), N35-P45 (4.5±2.3) and P45-N55 (6.1±2.8). In recordings made over the 7th cervical vertebra, it was possible to distinguish at least three components, namely N8 (peak latency 8.0±0.6ms), N11 (10.3±0.7) and N13 (12.0±0.9), in all subjects. From Erb's point a large amplitude potential (N9 : 8.7±0.5ms) was recorded and N20 (17.6±0.9ms) was recorded over the contralateral somatosensory cortex. These recordings employed a mid-frontal (Fz, 10-20 system) reference. The difference between peak latencies of N20 and N13 (central conduction time) was 5.7±0.5ms. The peak latencies of N9, N13, P15, N20, P25 and N35 each correlated positively with arm length, but the central conduction time did not correlate significantly with it. The differences between men and women were observed in N8, N9, N11, N13, N14, P15, N20, P25 and N35 latencies. These differences were probably due to the difference of the arm length.

Somatosensory Evoked Potentials Recorded from the Neck and Scalp Following Median Nerve Stimulation in Normal Man

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