N10 potential as an antidromic motor evoked potential in a median nerve short-latency somatosensory evoked potential study.

Full Abstract

When stimulating the mixed nerve to record evoked potential, both sensory and motor fibers are activated before entering the spinal cord. The N10 potential has been described as an antidromic motor evoked potential based on results obtained by recording at the anterior midneck. In the present study, we examined the changes in latencies of Erb's potential, N10, and N13 by stimulating the median nerve distally at the wrist and proximally at the elbow. The conduction velocity of N10 calculated by the difference between N10 latencies at the two stimulation points was consistent with motor conduction velocity, although N13 conduction velocity estimated by the same method reflected a sensory conduction velocity. A positive relation was also observed between the indirect latency from the stimulation point to the anterior root as calculated using the equation (F - M - 1) / 2 (ms) and the direct latency to the negative peak of the N10 potential. Our data support the notion that N10 represents antidromic motor potential originating in the spinal entry zone of the anterior root.

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Author information

Author/s: Inoue, Ken (K); Mimori, Yasuyo (Y); Nakamura, Shigenobu (S);

Affiliation: Third Department of Internal Medicine, Hiroshima University School of Medicine, 1-2-3 Kasumi Minami-ku, Hiroshima 734-8551, Japan. kenin_97(-atsign-)yahoo.com

Journal and publication information

Publication Type: Journal Article

Journal: Journal of clinical neurophysiology : official publication of the American Electroencephalographic Society (J Clin Neurophysiol), published in United States. (Language: eng)

Reference: 2002-Jan; vol 19 (issue 1) : pp 37-42

Dates: Created 2002/03/15; Completed 2002/05/28; Revised 2004/11/17;

PMID: 11896351, status: MEDLINE (last retrieval date: 12/26/2008)

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MeSH headings (categories)

This article was linked to the MESH Headings shown below.

Adolescent
Adult
Afferent Pathways - physiology
Aged
Brachial Plexus - physiology
Elbow - innervation
Electric Stimulation
Evoked Potentials, Motor - physiology
Evoked Potentials, Somatosensory - physiology
Female

Humans
Male
Median Nerve - physiology
Middle Aged
Muscle, Skeletal - innervation
Reaction Time - physiology
Reference Values
Spinal Nerve Roots - physiology
Synaptic Transmission - physiology
Wrist - innervation

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