抄録
We performed contralateral and ipsilateral evoked electromyography (EMG) of the orbicularis oris muscle in 9 normal subjects and 32 patients with facial palsies; 22 with Bell's palsy and 10 with Ramsay Hunt's syndrome. In the normal subjects, the amplitude ratio of the contralateral to the ipsilateral evoked EMG ranged from 1:5 to 1:2. In 15 of the patients with facial palsy, the amplitude ratios exceeded the normal range. The amplitude ratios in the denervated group tended to be larger than those in the nondenervated group. These results suggest that contralateral facial nerve fibers innervating beyond the midline might intensify to assist the function of the affected facial nerve.
