Electroneuronography is an electrophysiological measurement of the compound action potentials elicited by supramaximal stimulation of a peripheral nerve. In the evaluation of facial paralysis electroneuronography (ENoG) provides a quantitative assessment of the degree of degeneration. When interpreted within the pathophysiological context of the disease process, ENoG allows the surgeon to make a logical decision for facial nerve exploration. This videotape demonstrates the equipment, parameters, technique, and interpretation of results used in facial ENoG.