Myelinated nerve, TEM

Myelinated nerve, TEM


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Myelinated nerve. Transmission electron micrograph (TEM) of a section through a small myelinated nerve fibre (axon, circular, centre) from the lining of the trachea (windpipe). Myelin is an insulating fatty layer that surrounds the nerve fibre, 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. Magnification: x4000, when printed 10 centimetres wide.

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