Read about the various forms of muscular dystrophy at the web site of the Muscular Dystrophy Association. Motor neuron diseases, such as amyotrophic lateral sclerosis (ALS) are also described.

http://www.mdausa.org/disease/index.html

Amyotrophic lateral sclerosis is further considered in ALS - Progress, But Still No Cure for Lou Gehrig's Disease by the Mayo Clinic's Health Oasis.

http://www.mayohealth.org/mayo/9604/htm/als.htm

How calcium channel blockers work and concerns over their safety are addressed in the article entitled Calcium Channel Blockers - Are They Safe? by the Mayo Clinic's Health Oasis.

http://www.mayohealth.org/mayo/9511/htm/cabloc.htm