Lower brain-stem origin of the median nerve N18 potential

Henry G. Raroque, Hunt Batjer, Charles White, William L. Bell, Gary Bowman, Ralph Greenlee

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


A patient undergoing intraoperative median nerve somatosensory evoked potential (MSEP) and brain-stem auditory evoked response (BAER) monitoring showed changes during basilar artery aneurysm clipping. There was loss of the BAER wave V, with preservation of waves I and III. Simultaneously, there also was loss of the MSEP N20 potential, with preservation of the N18, N13 and Erb's point potentials. The patient died and autopsy showed an infarct involving the whole rostro-caudal extent of the pontine tegmentum. This combination of electrophysiologic and pathologic findings may help answer questions regarding the exact generators of different MSEP potentials. In particular, it implies that medullary structures can generate the N18 potential.

Original languageEnglish (US)
Pages (from-to)170-172
Number of pages3
JournalElectroencephalography and Clinical Neurophysiology
Issue number2
StatePublished - Feb 1994


  • Evoked potential
  • N18 potential
  • Somatosensory

ASJC Scopus subject areas

  • Neuroscience(all)
  • Clinical Neurology


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