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Electromyography (EMG) is a procedure to determine the health of muscles and nerve cells, also called motor neurons. The test results can show nerve problems, muscle problems or complications with nerve-to-muscle signal transmission. An EMG uses small devices called electrodes to convert these signals into graphs, sounds or numerical values that are then viewed by the doctor. During a needle procedure, a needle electrode inserted directly into a muscle documents the electrical activity in that muscle.

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