• Neuroreport · Feb 2000

    Which nerve fibers mediate the axon reflex flare in human skin?

    • M Schmelz, K Michael, C Weidner, R Schmidt, H E Torebjörk, and H O Handwerker.
    • Department of Physiology and Experimental Pathophysiology, University of Erlangen-Nürnberg, Erlangen, Germany.
    • Neuroreport. 2000 Feb 28; 11 (3): 645-8.

    AbstractAxon reflex vasodilatation due to transcutaneous electrical stimulation in human skin was measured by laser Doppler imaging. Constant current pulses of 10 mA, 0.2 ms, delivered at 1 or 10 Hz for 2 min through a probe of 30 mm2 surface area did not induce a significant flare response, though this stimulus previously has been found supra-maximal for cutaneous polymodal (mechano-heat responsive) C-nociceptors in microneurography experiments. Pulses of the same strength from a pointed probe yielding a higher current density induced an extended and persistent flare. This type of stimulus previously has been proven to recruit mechano-insensitive C-units in microneurography experiments, in contrast to stimuli from the 30 mm2 probe. It is concluded that mechano-insensitive C-nociceptors and not polymodal C-units mediate the axon reflex flare in human skin.

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