SCOTT CAMAZINE / SCIENCE PHOTO LIBRARY SCOTT CAMAZINE / SCIENCE PHOTO LIBRARY
Multiple sclerosis. Coloured magnetic resonance imaging brain scan of a patient with multiple sclerosis (MS). This is a horizontal section through the brain, with the eyeballs at left. Lesions caused by MS appear in the lower centre and upper right (red). MS is caused by deterioration of the myelin sheaths around nerve fibres. Progressive demyelination leads to such symptoms as unsteady gait, tremor, speech defects, paralysis and incontinence. The disease is thought to be an autoimmune disorder but the cause is not understood. No cure is known.
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