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American Neuromonitoring Associates
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Electromyography (EMG) measures the electrical activity in muscle. Since specific muscles are attached to specific nerves, nerve function can be implied from the type of activity seen in the EMG recording.
Resting muscle with normal attached nerve is usually electically silent on standard EMG recordings. When the nerve is irritated or injured, it will fire spontaneously, causing reciprocal firing in the muscle. This manifests as motor unit firing ('spontaneous' single motor unit firing) that can occur in several patterns indicating increasing degrees of irritation or injury including: spikes
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