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Myopathy is a disease of muscle in which the muscle fibers do not function properly. This results in muscular weakness. Myopathy simply means muscle disease (Greek myo- muscle + patheia < -pathy suffering). This meaning implies that the primary defect is within the muscle, as opposed to the nerves (neuropathies or neurogenic disorders) or elsewhere (e.g., the brain).
Nemaline myopathy is a rare genetic muscle disorder. Myopathy is a general medical term meaning disease of the muscle. At least six different forms of nemaline myopathy have been identified. The severity, age of onset, and inheritance pattern varies among these different forms of nemaline myopathy.