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the claim

Larger diameter myelinated axons have greater conduction velocities than small diameter myelinated axons

the verdict
SUPPORTED
the evidence backs this
Recorded sources
4 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that larger diameter myelinated axons have greater conduction velocities than small diameter myelinated axons?

Yes. Established neurophysiological principles and reviews confirm that larger diameter myelinated axons exhibit greater conduction velocities than smaller diameter myelinated axons.

Verdict: SUPPORTED · 4 sources for, 0 against · Last checked

The analysis

The claim is a well-established physiological principle stating that larger diameter myelinated axons have greater conduction velocities than smaller ones. Multiple reviews and empirical studies in the provided literature (such as papers 0, 3, 6, and 8) explicitly support this relationship via saltatory conduction dynamics and geometric properties. There are no papers contradicting this claim.

Evidence for · 4
Determinants of conduction velocity in myelinated nerve fibers
1980
Reviews physiological determinants of conduction velocity and notes that for geometrically similar fibers, conduction velocity is nearly proportional to diameter.
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Waxman, S. G. (1980). Determinants of conduction velocity in myelinated nerve fibers. doi.org. https://doi.org/10.1002/mus.880030207

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More for · 3
Molecular regulators of nerve conduction - Lessons from inherited neuropathies and rodent genetic models.
2015
Discusses how the geometric dimensions of myelinated nerve fibers, including axon diameter and myelin thickness, affect nerve conduction velocity.
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J, L. (2015). Molecular regulators of nerve conduction - Lessons from inherited neuropathies and rodent genetic models.. doi.org. https://doi.org/10.1016/j.expneurol.2015.03.009

Interplay between MRI-based axon diameter and myelination estimates in macaque and human brain
2025
Notes that axon diameter and myelin thickness affect the conduction velocity of action potentials in the nervous system according to established structure-function relationships.
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Gong, T., Maffei, C., Dann, E., Lee, H., Lee, H., Augustinack, J., Huang, S. Y., Haber, S. N., & Yendiki, A. (2025). Interplay between MRI-based axon diameter and myelination estimates in macaque and human brain. doi.org. https://doi.org/10.1162/imag_a_00576

Axonal structure-function relationships across experimental modalities
2025
Explores the structure-function relationship of myelinated nerve fibers linking axon diameter and myelin thickness to conduction velocity via saltatory mechanisms.
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Skoven, C., Andersson, M., Torre, M. L. B., Pizzolato, M., Siebner, H., & Dyrby, T. (2025). Axonal structure-function relationships across experimental modalities. doi.org. https://doi.org/10.1162/IMAG.a.1058

also asked as
  • Do larger diameter myelinated axons have greater conduction velocities than small ones?
  • Is it true that wider myelinated nerve fibers conduct signals faster than thinner ones?
  • Do thick myelinated axons really transmit impulses faster than thin myelinated axons?
  • Are conduction velocities higher in large diameter myelinated axons compared to smaller ones?
Receipt History
first checked05 Aug 2026
judged → SUPPORTED · 9205 Aug 2026
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