Introduction to Inherited Muscular Disorders
Muscular dystrophies are inherited, progressive muscle disorders resulting from defects in one or more genes needed for normal muscle structure and function. Facioscapulohumeral dystrophy is the most common form of muscular dystrophy, and Duchenne dystrophy is the second most common and most severe form. Becker dystrophy, although closely related to Duchenne, has a later onset and causes milder symptoms.
Muscular dystrophies are distinguished by the selective distribution of weakness and the specific nature of the genetic abnormality involved.