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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).
Myotubular myopathy, also known as centronuclear myopathy, is a slowly progressive disease that causes drooping of the eyelids, foot drop, facial weakness, and other muscle weakness. Nemaline myopathy, also known as Rod body disease, develops from birth to adulthood and is nonprogressive and usually not fatal.n some cases, myopathies can be caused by a malfunctioning gland (or glands), which produces either too much or too little of the chemical messengers called hormones. Hormones are carried by the blood and one of their many functions is to regulate muscle activity.