Millard-Gubler syndrome: electrophysiologic findings.

Millard-Gubler syndrome is caused by a lesion in the brainstem at the level of the facial nerve nucleus. This lesion involves the facial nerve nucleus, the abducent nerve, and the corticospinal tract. Clinical features are a weakness of all muscles innervated by the facial nerve and the lateral rectus on the involved side as well as weakness of the extremities on the contralateral side. Electrophysiologic findings are reported in this study. Conventional electrophysiologic approaches indicate a lower motor neuron type of facial involvement. Blink reflex studies indicate brainstem involvement.