Electromyography (EMG) Home A-Z Health Information Health Library A-Z Electromyography (EMG) Overview EMG is the other component of NCV, which is used to record the baseline muscle activity, motor units, and recruitment of multiple motor units on complete stimulation.It is helpful in differentiating between disorders of lower motor neuron disorders such as anterior horn cell, nerve, neuromuscular junction, and muscles. Method A thin needle electrode is inserted in the musclesMuscle activity is studied Indications Diagnosis of muscle dystrophy and other muscle diseasesEvaluation of muscle weakness or paralysisSingle fibre EMG for neuromuscular diseasesEvaluation of peripheral neuropathy/ radiculopathy/ nerve compression/ entrapmentEstablishing diagnosis of anterior horn cell disordersEvaluation of cramps/ spasms/ tremors