ABSTRACT
Most EDX evaluations involve two complementary parts: nerve conduction studies (NCS) and needle electromyography (EMG). NCS yield information about electrical conduction along large ber motor and sensory nerves. Needle EMG samples muscle bers with a small needle electrode and can provide information regarding the entire motor unit from the anterior horn cell in the spinal cord to the muscle bers it eventually innervates. The term “electromyography” or “EMG” is often inappropriately used to describe all components of the EDX evaluation but should properly be reserved for describing only the needle examination.2
