Ann Clin Neurophysiol.  2017 Jan;19(1):3-12. 10.14253/acn.2017.19.1.3.

Sensory and motor axons are different: implications for neurological disease

Affiliations
  • 1Department of Neurology, Royal Prince Alfred Hospital, University of Sydney, Sydney, Australia. david.burke@sydney.edu.au
  • 2Brain and Mind Centre, University of Sydney, Sydney, Australia.

Abstract

Using threshold tracking, differences have been established between large myelinated sensory and α 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.

Keyword

Axonal excitability; Threshold tracking; Sensory axons; Motor axons; Conduction block

MeSH Terms

Axons*
Humans
Myelin Sheath
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