The EMG is helpful in that it can confirm or rule out conditions such as muscular dystrophy, myasthenia gravis, polio and amyotrophic lateral sclerosis, where the nerves have difficulty communicating with muscles. The procedure is often ordered when a patient has neurologic symptoms such as numbness, tingling or burning, limb pain, muscle cramping or weakness. Because these motor neurons use electrical signals to communicate with the muscles, the speed and strength of these signals can be measured and interpreted to reveal disease, dysfunction or the need for further investigation. The motor neurons are the specialized nerve cells that transmit information from the brain to the muscles. Electromyography (EMG) is a diagnostic procedure that is used to reveal the health or dysfunction that exists in nerves, muscles or in how the two communicate with each other.
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