| unmyelinated | Denoting nerve fibres (axons) lacking a myelin sheath. Synonym: amyelinated, amyelinic, nonmedullated, nonmyelinated, unmedullated. (05 Mar 2000) |
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| unmyelinated fibres | A fibre having no myelin covering (CNS); a naked axon; in the PNS represented by all axons lying in troughs in a single Schwann cell (Schwann cell unit); a slow conducting fibre. Synonym: gray fibres, nonmedullated fibres, Remak's fibres. (05 Mar 2000) |
| unmyelinated nerve | <anatomy, nerve> A nerve made up largely, or exclusively, of unmyelinated fibres; a nerve composed of axons having no myelin covering, but lying in troughs in Schwann cells; a slow conducting nerve. (05 Mar 2000) |
| unmyelinated f.’s |
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.
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