Parkinson's disease occurs when neurons (nerve cells) in a part of the
brain called the substantia nigra degenerate, die off. The loss of
these cells disrupts the brain's normal control of movement, causing the
person to experience slowed movements, stiffness or rigidity, and
tremor. Use the links below to find specific information about
parkinson's disease. All links will open in a new window.
Parkinson's disease explained
