Advanced

Nociceptive C fibre input to the primary somatosensory cortex (SI). A field potential study in the rat.

Kalliomäki, Jarkko ; Weng, Han Rong ; Nilsson, Hans Jörgen LU and Schouenborg, Jens LU (1993) In Brain Research 622(1-2). p.262-270
Abstract

In the present study, noxious thermal stimulation of the skin with short pulses of CO2-laser radiation was used to identify a cutaneous nociceptive C fibre input to SI and investigate the organization of this input in halothane-nitrous oxide anaesthetized rats. Noxious CO2-laser stimulation of the glabrous skin of the hindpaw consistently evoked late surface positive field potentials in SI (average onset latency 226 ms, peak latency 296 ms). It was demonstrated that these late potentials were evoked by an input from nociceptive C fibres, using a combination of latency measurements, anodal block of A fibre conduction and graded intensities of stimulation. Compared to the tactile evoked potentials in SI, the... (More)

In the present study, noxious thermal stimulation of the skin with short pulses of CO2-laser radiation was used to identify a cutaneous nociceptive C fibre input to SI and investigate the organization of this input in halothane-nitrous oxide anaesthetized rats. Noxious CO2-laser stimulation of the glabrous skin of the hindpaw consistently evoked late surface positive field potentials in SI (average onset latency 226 ms, peak latency 296 ms). It was demonstrated that these late potentials were evoked by an input from nociceptive C fibres, using a combination of latency measurements, anodal block of A fibre conduction and graded intensities of stimulation. Compared to the tactile evoked potentials in SI, the nociceptive C fibre evoked potentials were more widespread and exhibited a crude somatotopical organization. Intracortically, both tactile and nociceptive C fibre evoked potentials reversed polarity and exhibited a peak negativity in laminae III-IV. The nociceptive C fibre evoked potentials exhibited an additional peak negativity in laminae V-VI. The latter potential had a different time course as compared to the nociceptive C fibre potential evoked in laminae III-IV. In conclusion, an input from cutaneous nociceptive C fibres to SI was demonstrated for the first time in animal experiments. The input to SI from tactile receptors and cutaneous C nociceptors were differently organized.

(Less)
Please use this url to cite or link to this publication:
author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Cerebral cortex, CO-laser, Evoked potential, Nociception, Pain, Somatosensory pathway
in
Brain Research
volume
622
issue
1-2
pages
9 pages
publisher
Elsevier
external identifiers
  • scopus:0027226131
  • pmid:8242365
  • scopus:0027226131
ISSN
1872-6240
DOI
10.1016/0006-8993(93)90827-A
language
English
LU publication?
yes
id
32740eb9-dcf5-4de5-a9b0-697fa3efd8c3
date added to LUP
2019-06-24 16:25:31
date last changed
2020-01-13 02:06:05
@article{32740eb9-dcf5-4de5-a9b0-697fa3efd8c3,
  abstract     = {<p>In the present study, noxious thermal stimulation of the skin with short pulses of CO<sub>2</sub>-laser radiation was used to identify a cutaneous nociceptive C fibre input to SI and investigate the organization of this input in halothane-nitrous oxide anaesthetized rats. Noxious CO<sub>2</sub>-laser stimulation of the glabrous skin of the hindpaw consistently evoked late surface positive field potentials in SI (average onset latency 226 ms, peak latency 296 ms). It was demonstrated that these late potentials were evoked by an input from nociceptive C fibres, using a combination of latency measurements, anodal block of A fibre conduction and graded intensities of stimulation. Compared to the tactile evoked potentials in SI, the nociceptive C fibre evoked potentials were more widespread and exhibited a crude somatotopical organization. Intracortically, both tactile and nociceptive C fibre evoked potentials reversed polarity and exhibited a peak negativity in laminae III-IV. The nociceptive C fibre evoked potentials exhibited an additional peak negativity in laminae V-VI. The latter potential had a different time course as compared to the nociceptive C fibre potential evoked in laminae III-IV. In conclusion, an input from cutaneous nociceptive C fibres to SI was demonstrated for the first time in animal experiments. The input to SI from tactile receptors and cutaneous C nociceptors were differently organized.</p>},
  author       = {Kalliomäki, Jarkko and Weng, Han Rong and Nilsson, Hans Jörgen and Schouenborg, Jens},
  issn         = {1872-6240},
  language     = {eng},
  number       = {1-2},
  pages        = {262--270},
  publisher    = {Elsevier},
  series       = {Brain Research},
  title        = {Nociceptive C fibre input to the primary somatosensory cortex (SI). A field potential study in the rat.},
  url          = {http://dx.doi.org/10.1016/0006-8993(93)90827-A},
  doi          = {10.1016/0006-8993(93)90827-A},
  volume       = {622},
  year         = {1993},
}