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Parkinson's vs. Huntington's vs. Lou Gehrig's Disease

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They all are movement disorder disease. What makes them differ from each other? Thanks.
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replied July 9th, 2009
There are several parts of the brain involved with successful movement, then nerves that carry the brain's instructions to the muscles, and then the muscles that carry out the action. Each of these "links in the chain" can have something go wrong with it and they can go wrong in different ways and that's how you get the many different movement disorder diseases.

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