Journal Article

Peripheral projections of sensory fascicles in the human superficial radial nerve

M. Campero, J. Serra and J. L. Ochoa

in Brain

Published on behalf of The Guarantors of Brain

Volume 128, issue 4, pages 892-895
Published in print April 2005 | ISSN: 0006-8950
Published online February 2005 | e-ISSN: 1460-2156 | DOI: http://dx.doi.org/10.1093/brain/awh438
Peripheral projections of sensory fascicles in the human superficial radial nerve

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The sensory territories of different cutaneous fascicles of the superficial radial nerve were delineated by microneurography at the level of the distal forearm in humans. Three fascicular patterns were found at this level: one supplying the dorsum of the radial aspect of the dorsum of the hand over the first dorsal interosseous space; another supplying the lateral aspect of the first metacarpal extending to the lateral aspect of the thumb; and a third innervating the second interosseous space and the proximal phalanx of the index and middle fingers. The compound fascicular territory is comparable to the classical territory described for the superficial radial nerve. Intraneural microstimulation of individual fascicles did not evoke paraesthesiae or pain beyond their fascicular territory, regardless of the stimulus intensity. We conclude that the superficial radial nerve at the forearm in man is composed of only three fascicles, as shown by the present study and from previous anatomical work. Referred pain seems related to nerve activity in afferent fibres from fascicles supplying deep tissues and muscles, not from cutaneous afferents.

Keywords: nerve; fascicle; microneurography; intraneural stimulation; receptive field

Journal Article.  1914 words.  Illustrated.

Subjects: Neurology ; Neuroscience

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