Unmyelinated axon
(
Remak, 1837
)
: An axon (Kölliker, 1896) with no myelin sheath. Axons below a threshold diameter characteristic of particular species remain unmyelinated, thus forming the set of thinnest axons; see Williams (1995, pp. 951-954). The (unmyelinated) axon was discovered by Remak (1837) who called it a primitive band.
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