Myelinated Nerve Axons and Schwann Cells

Myelinated Nerve Axons and Schwann Cells

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Credit: Biophoto Associates/SCIENCE PHOTO LIBRARY

Caption: Freeze-fractured Transmission Electron Micrograph (TEM) of myelinated nerve axons embedded in Schwann cells. 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). The rate of conduction of nerve impulses (action potential) is proportional to axon diameter. Myelination greatly increases axon conductivity velocity. Magnification: 60,000x when printed at 8x10'.

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Keywords: axon, cell, colorized, enhance, enhancement, freeze fractured, freeze-fracture, histological, histology, micrograph, micrography, microscopy, myelin, myelin layers, myelin sheath, myelinated, myelination, nerve, nerve axon, nervous system, organelle, schwann cell, tem, transmission electron micrograph

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