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Peripheral projections of nociceptive unmyelinated axons in the human peroneal nerve
1989 (English)In: Journal of Physiology, ISSN 0022-3751, E-ISSN 1469-7793, Vol. 416, no 1, p. 291-301Article in journal (Refereed) Published
Description
Abstract [en]

1. Previous knowledge of the anatomical course of unmyelinated (C) axons along a peripheral nerve has been scarce and has led to the concept of the axons in a constantly interchanging position. 2. Results obtained by microneurography in the peroneal nerve at knee or ankle levels in awake humans demonstrated that the receptive fields of neighbouring C units in the nerve cluster in close vicinity on the skin of the foot or the ankle. These findings indicate that C afferents run closely together throughout large portions of the peripheral nerve. 3. Intraneural microstimulation performed at neural sites where nociceptive C units were recorded induced painful sensations projected to the skin. When the stimulus intensity was increased, there was typically a concentric increase in the area of projected pain, rather than recruitment of several scattered pain projections. This finding further supports the hypothesis of a neighbouring relation of nociceptive C axons within nerve fascicles, implying spatial recruitment of adjacent axons in the nerve with adjacent peripheral projections. 4. A pain locognosia test performed during ischaemic block of impulse conduction in myelinated fibres demonstrated a fairly precise cerebral localization of noxious events on the foot from the input of C afferent fibres alone.

Place, publisher, year, edition, pages
Wiley-Blackwell Publishing Ltd. , 1989. Vol. 416, no 1, p. 291-301
National Category
Surgery
Identifiers
URN: urn:nbn:se:hb:diva-7516Local ID: 2320/8399OAI: oai:DiVA.org:hb-7516DiVA, id: diva2:888379
Available from: 2015-12-22 Created: 2015-12-22 Last updated: 2017-10-21Bibliographically approved

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Lundberg, Lars

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