Unmyelinated and Myelinated Nerve Fibers

Unmyelinated and Myelinated Nerve Fibers

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Credit: David M. Phillips/SCIENCE PHOTO LIBRARY

Caption: Composite transmission electron micrographs (TEMs) showing unmyelinated nerve fibers (top) and myelinated ones (bottom). Peripheral nervous system nerves consist of axons enveloped in specialized metabolic and support cells (Schwann cells). Larger axons are wrapped in concentric layers of Schwann cell plasma membrane, the myelin sheath (in red). The rate of conduction of nerve impulses (action potential) is proportional to axon diameter. Myelination greatly increases axon conductivity velocity. Magnification = 25,000x at 5x7 inch print size.

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Keywords: axon, cell, colorized, composite, enhance, enhancement, histological, histology, micrograph, micrography, microscopy, myelin, myelin layers, myelin sheath, myelinated, myelination, nerve, nerve axon, nerve fibre, nervous system, schwann cell, tem, transmission electron micrograph, unmyelinated

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