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Unmyelinated and Myelinated Nerve Fibres

Unmyelinated and Myelinated Nerve Fibres

C022/0122

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Credit

BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY

Caption

Composite transmission electron micrographs (TEMs) showing unmyelinated nerve fibres (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 dark blue). 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.

Release details

Model release not required. Property release not required.

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