MONICA SCHROEDER / SCIENCE PHOTO LIBRARY MONICA SCHROEDER / SCIENCE PHOTO LIBRARY
Illustration of a man with Parkinson's disease. Parkinson's is a degenerative disorder of the central nervous system. It effects a person's motor skills early on, and later in the disease thinking and behavioural problems may also arise. The four major motor symptoms are: tremor, rigidity, slowness of movement, and postural instability.
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