Brachial plexus and radicular neurography in relation to cortical evoked responses.

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Abstract
An application of somatosensory potential recording suitable for clinical neurodiagnostics is described. Evoked responses were recorded with surface electrodes at 4 levels between wrist and scalp: Erb''s point, seventh cervical spine, inion and the somatosensory area of the scalp. The normal latency and latency difference values based on 16 healthy subjects and those of 4 examples of pathological cases with lesions at various levels in the nervous system are presented. The method offers novel possibilities for solving problems of differential diagnosis, especially at the level of the brachial plexus.

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