A nerve fiber is a threadlike extension of a nerve cell and consists of an axon and myelin sheath (if present) in the nervous system. There are nerve fibers in the central nervous system and peripheral nervous system. A nerve fiber may be myelinated and/or unmyelinated. In the central nervous system (CNS), myelin is produced by oligodendroglia cells. Schwann cells form myelin in the peripheral nervous system (PNS). Schwann cells can also make a thin covering for an axon which does not consist of myelin (in the PNS). A peripheral nerve fiber consists of an axon, myelin sheath, Schwann cells and its endoneurium. There are no endoneurium and Schwann cells in the central nervous system.
Read more about Nerve Fiber: Central Nerve Fibers, Peripheral Nerve Fiber Types, Components of Peripheral Nerve Fiber, Classification of Peripheral Nerve Fibers, Motor Fibers of The A Group, Sensory Fibers of The A Group, Regeneration of Peripheral Nerve Fibers
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