unmyelinated fibers

unmyelinated nerve fibers nerve fibers (axons) that lack the myelin sheath but may be enclosed by a neurilemma. Called also nonmedullated f's and nonmedullated nerve f's. Cf. myelinated f's.

Medical dictionary. 2011.

Look at other dictionaries:

  • unmyelinated — Denoting nerve fibers (axons) lacking a myelin sheath. SYN: amyelinated, amyelinic, nonmedullated, nonmyelinated, unmedullated. * * * un·my·elin·at·ed mī ə lə .nāt əd adj lacking a myelin sheath <unmyelinated axons> * * * …   Medical dictionary

  • unmyelinated — adjective (of neurons) not myelinated • Ant: ↑myelinated • Pertains to noun: ↑myelin * * * “+ adjective : lacking a myelin sheath the unmyelinated fiber found in the mammalian central nervous system H.J.Curtis & K.S.Cole * * * …   Useful english dictionary

  • unmyelinated — /un muy euh leuh nay tid/, adj. Anat. pertaining to nerve fibers that are not covered with a myelin sheath. [1915 20; UN 1 + MYELINATED] * * * …   Universalium

  • unmyelinated nerve — a nerve whose fibers (axons) are not encased in a myelin sheath, and which may or may not be enclosed by a neurilemma. Cf. myelinated n …   Medical dictionary

  • C fibers — unmyelinated nerve fibers, having a smaller diameter (0.3 to 1.3 μm) and a slower conduction velocity (0.6 to 2.3 meters per second) than alpha fibers. They are found as postganglionic (efferent) fibers of the autonomic nervous system, and… …   Medical dictionary

  • gray fibers — unmyelinated nerve fibers, found largely, but not exclusively, in the sympathetic nerves …   Medical dictionary

  • pilomotor fibers — unmyelinated nerve fibers going to the small muscles of the hair follicles …   Medical dictionary

  • sudomotor fibers — unmyelinated nerve fibers going to the sweat glands …   Medical dictionary

  • vasomotor fibers — unmyelinated nerve fibers going chiefly to arteriolar muscles …   Medical dictionary

  • myelinated fibers — myelinated nerve fibers grayish white nerve fibers whose axons are encased in a myelin sheath, which may in turn be enclosed by a neurilemma; called also medullated f s and medullated nerve f s. Cf. unmyelinated f s …   Medical dictionary

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.