from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Lacking a myelin sheath. Used of a nerve fiber.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Not myelinated.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. (of neurons) not myelinated


from Wiktionary, Creative Commons Attribution/Share-Alike License

un- +‎ myelinated


  • The researchers found that the fibres, called unmyelinated low-threshold mechanoreceptors


  • These unmyelinated, specialized nerve fibers, called C-tactile fibers, each cover about one square centimeter of skin.

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  • Those sensations are coming via unmyelinated nerves, and give you some idea of the level of sensation in an embryo.

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  • In relatively primitive organisms like clams, all nerves are unmyelinated.

    Stem cells, Part 1, Introduction and Ethics

  • In humans, some nerves remain unmyelinated, and those holdovers from early evolutionary time can't be anesthetised.

    Stem cells, Part 1, Introduction and Ethics

  • But there is a second slow-conducting nerve network of unmyelinated fibres, called C-tactile (CT), the role of which was unknown.

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  • These constricted unmyelinated regions are called nodes of Ran-vier (rahn-vee-ay), after the French histologist Louis Antoine

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  • "In my present view, the leading hypothesis for the observed rapid that previously unmyelinated axonal fibers within white matter become rapidly myelinated when they start to carry frequent action potentials," he says.

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  • The two subcategories of CMH classes of C-nociceptive afferents exhibit similar conduction velocity (~0. 8 m/s) and radiant heat threshold (~45 °C) [28]; both were therefore likely to be involved in the triggering of the psychophysical responses to unmyelinated C-fibers reported in the present work.

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  • Although we did not make a formal determination of the conduction velocity of the fibers that triggered the sensation of warmth, the psychophysical latencies of the warm responses were found to be compatible with unmyelinated C-fibers at the faster end of their range (~2 m/s).

    PLoS ONE Alerts: New Articles


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