Myelinated Nerve Cell

Myelin is a dielectric (electrically insulating) material that forms a layer, the myelin sheath, usually around only the axon of a neuron.  It is essential for the proper functioning of the nervous system. Myelin is an outgrowth of a type of glial cell (neurolemmocyte). (adapted from wikipedia)

mouseover for labels     Image from Trinity  (source). Myelinated nerve cell

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