Tags: Anatomical Structure.
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).
