Erb's and cervical somatosensory evoked potentials: correlations with body size.

Median and ulnar Erb's (N9) and cervical (N13) somatosensory evoked potentials were correlated with height, arm span, arm length, and Erb's length. All body measurements had high correlations with the N9 and N13 latencies. The highest correlation was obtained between the N9 latency and Erb's length. The N13 latency was correlated higher with height than with arm length. The data suggest that height can be used to construct normogram correlating with the N13 latency.