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Certain neurons can repair themselves while others can't. Neurons that can repair themselves are refreed to as white matter. The reason white matter can repair itself is because the axons of white matter are myelinated.
Nerve cells send signals along long wires called axons, which are insulated with a fatty substance called myelin. The myelin sheath allows signals to be transmitted rapidly from the nervous system to the rest of the body. When myelin is destroyed -- called demyelination -- nerve signals are slowed or stopped. In the central nervous system -- the brain and spinal cord -- myelin cannot repair itself after it is damaged. However, in the peripheral nervous system -- the nerves that travel to the arms and legs -- myelin can often regrow. A number of diseases affect the myelin sheath in the central and peripheral nervous system. Video of the Day