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Microtubules in Axon, TEM

Microtubules in Axon, TEM

C025/2988

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Credit

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

Caption

Colour-enhanced Transmission Electron Micrograph (TEM) of a longitudinal section of an axon with many microtubules. Axons are easily recognized by their content of smooth endoplasmic reticulum and microtubules. Peripheral nervous system nerves consist of axons enveloped in specialized metabolic and support cells called 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.

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