Facial trigeminal synkinesis associated with a trigeminal schwannoma

The authors describe the clinical and electrophysiologic findings in a pati ent with synkinesis between muscles innervated by the facial and trigeminal nerves after resection of a trigeminal schwannoma. Conventional facial ner ve conduction and blink reflex studies were normal. Stimulation of the supr aorbital and facial nerves elicited reproducible responses in the masseter and pterygoid muscles, confirming a peripheral site of aberrant regeneratio n of the facial and trigeminal nerves.