Comparing the size, speed and strength of the transmitted signal allows for the measurement of the integrity of the facial nerve. The electrode behind the ear emits an electrical pulse and the electrode at the nasolabial fold picks up the any signal that is transmitted by the facial nerve fibers. The first is taped over the stylomastoid foramen behind and under the ear and the second is taped near the nasolabial fold. Two electrodes are taped to one side of the face. ENoGĮlectroneuronography is a test usually performed by audiologists to assess the integrity of the facial nerve. Electrical silence is associated with a chronically denervated muscle, which can no longer be successfully reinnervated. This means that the muscles are still alive and awaiting a signal from a nerve, but that a nerve has not yet demonstrated evidence of the onset of recovery. Muscles which are not experiencing reinnervation demonstrate fibrillation potentials or baseline, random electrical noise. Muscles which are undergoing reinnervation demonstrate the presence of action potentials and spike and wave activity. Nerve signals are thereby recorded which yield information about the health of the nerve and muscle. Small needles are inserted into select facial muscles and patients are asked to contract those muscles. It is usually employed greater than 6 months following the onset of facial nerve paralysis. Electromyography is a neuroelectrophysiological test that evaluates the health and integrity of the facial nerve.
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