Somatosensory evoked potentials after stimulation of digital nerves in upper limbs: normative data.

Normative data for somatosensory evoked potentials (SEPs) after stimulation of digital nerves from the first, third and fifth digits, which reach the spinal cord through C6, C7 and C8 roots are presented in 20 normal adults. SEP peak latencies and amplitudes are indicated for Erb's point, the level of the seventh and second cervical vertebrae and contralateral cortical hand area.