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Parkinson's disease

Parkinson's disease (paralysis agitans or PD) is a neurodegenerative disease of the substantia nigra, an area in the basal ganglia of the brain.

The disease involves a progressive disorder of the extrapyramidal system, which controls and adjusts communication between neurons in the brain and muscles in the human body.

It also commonly involves depression and disturbances of sensory systems.

Note:   The above text is excerpted from the Wikipedia article "Parkinson's disease", which has been released under the GNU Free Documentation License.
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July 5, 2015

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updated 12:56 pm ET