HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY
Demyelinated nerves. Light micrograph of a section through nerve fibres showing demyelination due to multiple sclerosis (MS). Demyelination is a loss of the protective sheath of myelin, a fatty substance that normally covers nerve fibres and helps nerves to conduct signals more efficiently. Loss of myelin disrupts the process, causing symptoms ranging from tingling and numbness, to unsteadiness, vision and speech defects, and paralysis. The cause of MS is unknown, and there is no effective treatment. Magnification: x440 when printed 10 centimetres wide.
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