Amyotrophic Lateral Sclerosis also known as Lou Gehrig's disease

Amyotrophic lateral sclerosis (ALS), sometimes called Lou Gehrig's disease, is a rapidly progressive, invariably fatal neurological disease that attacks the nerve cells (neurons)responsible for controlling voluntary muscles (muscle action we are able to control, such as those in the arms, legs, and face). For more refer http://www.ninds.nih.gov/disorders/amyotrophiclateralsclerosis/detail_ALS.htm