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Monika Freidel
Monika Freidel • 2 years ago

Scanning electron micrograph of fracture of a nerve fibre with central cytoplasm (C) and encirclng myelin (M)

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✯ Nerve fibres :: Myelinated nerve fibres, coloured scanning electron micrograph (SEM). The myelin sheath is pink, the axoplasm is dark brown and the endoneurium (connective tissue) is yellow.✯

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Myelinated nerves. Coloured scanning electron micrograph (SEM) of a section through the sciatic nerve, showing the myelinated nerve fibres (axons). Myelin (blue) is an insulating fatty layer that surrounds the nerve fibre (brown), increasing the speed at which nerve impulses travel. It is formed when Schwann cells wrap around the fibre, depositing layers of myelin between each coil. The outermost layer consists of the Schwann cell's cytoplasm and is known as the neurolemma or sheath of Schwann.

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