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Surrounding each muscle fiber (cell) is a delicate external lamina composed primarily of reticular fibers. This external lamina is produced by the muscle fiber and, when observed through the light microscope, cannot be distinguished from the cell membrane of the muscle fiber, the sarcolemma.
Nerve Fiber: Nerve fiber is a thread like extension of a neuron, which is formed by the axon and its covering. Thus each nerve fiber is an axon with its coverings. Larger axons are covered by a myelin sheath and are termed myelinated or medullated fibers.