How are ulnar nerve somatosensory evoked potentials (SEPs) recorded?

Updated: Feb 26, 2019
  • Author: Sombat Muengtaweepongsa, MD, MSc; Chief Editor: Selim R Benbadis, MD  more...
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Answer

Answer

Ulnar nerve SEPs are preferred to median nerve SEPs for assessing the lower cervical spinal cord, especially during intraoperative monitoring when this part of the spinal cord is at risk, because the ulnar nerve originates from spinal roots C8-T1, whereas the median nerve originates from C6-T1. Ulnar nerve SEPs will detect dorsal column damage at the C7-C8 level, but the median nerve SEPs may persist, mediated by sensory fibers that enter the spinal cord at the C6 level.


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