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Unmyelinated afferents in human skin and their responsiveness to low temperature

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2010
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Campero Soffia, Mario
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Unmyelinated afferents in human skin and their responsiveness to low temperature
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  • Campero Soffia, Mario;
  • Bostock, Hugh;
Abstract
In humans, there are different types of cutaneous cold-sensitive afferents responsible for cold sensation and cold pain. Innocuous cold is primarily mediated by a population of slow A delta afferents, based on psychophysical and neurophysiological studies. Noxious cold (usually below 15 ◦C) is mediated, at least in part, by polymodal nociceptors. There is also a population of unmyelinated afferents responsive to innocuous low temperature, some of which also respond to heat, whose sensory function has not been completely defined. A paradoxical hot/burning evoked by cooling is unmasked by A-fibre block, and similar sensations are evoked by applying simultaneous cool and warm stimuli to adjacent skin areas. These unmyelinated fibres activated by innocuous cooling (and heating) may contribute to this hot/burning sensation, along with other thermoregulatory functions.
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This work has been partially supported by NIH Grant 5R01NS048932-03.
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URI: https://repositorio.uchile.cl/handle/2250/128560
DOI: doi:10.1016/j.neulet.2009.06.089
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Neuroscience Letters 470 (2010) 188–192
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