Multiple sclerosis. Coloured magnetic resonance imaging (MRI) scan of damage (pink, arrowed) to the spinal cord due to multiple sclerosis (MS). Healthy nerve tissue is yellow. The damaged areas (plaques) are where the myelin covering of the nerves in the spinal cord has been destroyed. This impairs the functioning of the nerves, as myelin enhances the conduction of signals along the nerve fibre. In MS, functions controlled by the affected nerves deteriorate. Typical symptoms of MS include weakness, tingling pain, slurred speech, double vision and even paralysis. It is not known exactly what causes MS, and there is no cure.
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