What is Parkinson’s disease? Parkinson’s disease (PD) is a chronic, progressive neurological disease that affects nerve cells (neurons) in an area of the brain called the substantia nigra. These cells normally produce dopamine, a chemical (neurotransmitter) that...
Alzheimer’s disease (AD) is a progressive, fatal brain disease. According to the 2011 Alzheimer’s Disease Facts and Figures report from the Alzheimer’s Association, 5.4 million people in the U.S. have Alzheimer’s disease. With the aging of the population, and without...
