Annals of Clinical Neurophysiology

The Korean Society of Clinical Neurophysiology (대한임상신경생리학회)
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Sensory and motor axons are different: implications for neurological disease

  • Burke, David (Department of Neurology, Royal Prince Alfred Hospital, University of Sydney) ;
  • Howells, James (Brain and Mind Centre, University of Sydney) ;
  • Kiernan, Matthew C. (Department of Neurology, Royal Prince Alfred Hospital, University of Sydney)
  • Received : 2016.09.06
  • Accepted : 2016.09.15
  • Published : 2017.01.31
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Abstract

Using threshold tracking, differences have been established between large myelinated sensory and ${\alpha}$ motor axons in humans. Major differences are that sensory axons are relatively depolarised at rest such that they have a greater persistent $Na^+$ current, and have greater activity of hyperpolarisation-activated cyclic nucleotide-gated (HCN) channels. Sensory axons may thereby be protected from hyperpolarising stresses, and are less likely to develop conduction block. However, the corollary is that sensory axons are more excitable and more likely to become ectopically active.

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References

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