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Updated: Jan 20, 2026
Wireless Surface Electromyography Recording of Facial Muscle Activity During Expressions
Published on: November 9, 2025
Needle electromyography: basic concepts and patterns of abnormalities
1Department of Neurology, Mayo Clinic, 4500 San Pablo Road, Jacksonville, FL 32224, USA. Rubin.Devon@mayo.edu
Abstract:
Needle electromyography (EMG) records electrical signals generated from muscle fibers and interprets the signals to characterize underlying pathologic changes that are occurring in motor units within muscles. Different types of spontaneously firing waveforms and motor unit potential changes occur with different neuromuscular disorders. The performance of reliable EMG studies depends on the technical skills of the physician in inserting, moving, recording with a needle electrode, and analyzing electric signals recorded from muscle. This article reviews the technique of needle EMG and recognition and interpretation of various EMG waveforms. The author presents several demonstrative videos at www.neurologic.theclinics.com.
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