Unmyelinated Nerve Cells

Unmyelinated nerve fibers do not have the concentric myelin sheaths that surround other types of nerve, instead the axons are enveloped within invaginations of the Schwann cell (neurolemmocyte) cytoplasm. (diagram link) 
mouseover for muscle illustration   Image from Yale Histology.  False color TEM of a Schwann cell (Neurolemmocyte), The nucleus is in blue, an the axons in pink 

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