Peripheral nerves, SEM

Peripheral nerves, SEM

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Credit: STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY

Caption: Peripheral nerves. Coloured scanning electron micrograph (SEM) of a freeze-fracture through peripheral nerves to show Schwann cells (yellow) and myelinated nerve fibres (pink). A Schwann cell wraps its cell membrane around a nerve (axon) a number of times. In between each layer of membrane 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. Endoneurium, delicate connective tissue (beige) surrounds the myelinated nerve fibres. Magnification not known.

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Keywords: anatomy, axon, axons, coloured, endoneurium, fibres, fracture, freeze-fracture, human body, images, magnified image, microscopic photos, myelin sheath, myelinated, myelination, nerve fibre, nerves, nervous, neurofilment, neurofilments, nucleolus, nucleus, scanning electron micrograph, schwann cell, sem, subjects, system, tubule, tubules

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