Myelinated nerves, SEM

Myelinated nerves, SEM

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Credit: STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY

Caption: Myelinated nerves. Coloured scanning electron micrograph (SEM) of a freeze-fracture through peripheral nerves to show Schwann cells (green) and myelinated nerves (pink). A Schwann cell wraps its cell membrane around the nerve a number of times. In-between each cell membrane layer is a layer of myelin, an electrically insulating fatty layer. A Schwann cell effectively thickens a nerve's membrane and increases the speed at which nerve impulses are relayed. The Schwann cell's cytoplasm surrounds the axons (beige).

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Keywords: anatomy, axon, axons, coloured, cytomplasm, fibres, fracture, human body, myelin sheath, myelinated, myelination, nerve fibre, nerves, nervous, neurofilament, neurofilaments, plasma membrane, scanning electron micrograph, schwann cell, sem, system, tubule, tubules

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