When you play the piano or hit a tennis ball you are activating the cerebellum. The cerebellum is the area of the brain that controls coordination and balance. Problems with the cerebellum include
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Cancer
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Genetic disorders
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Ataxias - failure of muscle control in the arms and legs that result in movement disorders
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Degeneration - disorders caused by brain cells decreasing in size or wasting away
Treatment of cerebellar disorders depends on the cause.
NIH: National Institute of Neurological Disorders and Stroke
National Library of Medicine | National Institutes of Health | Department of Health and Human Services