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Activity-dependent slowing properties of an unmyelinated low threshold mechanoreceptor in human hairy skin

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2011-04-15
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Campero Soffia, Mario
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Activity-dependent slowing properties of an unmyelinated low threshold mechanoreceptor in human hairy skin
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Author
  • Campero Soffia, Mario;
  • Bostock, Hugh;
  • Baumann, Thomas K.;
  • Ochoa, José L.;
Abstract
It has been previously shown that unmyelinated afferent fibres in human skin are differentiated not only by their receptor characteristics, but also by their profiles of activity-dependent slowing. One type of profile, described originally as 'type 3', is different from that of nociceptors (type 1), cold afferents (type 2) and sympathetic efferents (type 4), in that these fibres display a minimal activity-dependent slowing (similar to 1% at 2 Hz). However, their function remains to be determined. Here we describe one unit with a typical 'type 3' activity-dependent slowing profile recorded from an undamaged fascicle of the superficial peroneal nerve of a patient. Its conduction velocity was 1.8 ms(-1) and it slowed by 1.3% during the 2 Hz tetanus. This unit had a mechanical receptive field in the hairy skin and responded readily to weak mechanical stimuli, and not to cold. This suggests that the low threshold unmyelinated mechanoreceptors recently described in human hairy skin are probably endowed with a 'type 3' activity-dependent profile.
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This work has been partially supported by NIH Grant 5R01NS048932.
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URI: https://repositorio.uchile.cl/handle/2250/128801
DOI: DOI: 10.1016/j.neulet.2011.02.012
ISSN: 0304-3940
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NEUROSCIENCE LETTERS Volume: 493 Issue: 3 Pages: 92-96 Published: APR 15 2011
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