EXPERIMENTAL-STUDY ON REINNERVATION OF VOCAL CORD ADDUCTORS WITH THE ANSA CERVICALIS

The purpose of this study was to reestablish the adduction of the para lyzed vocal cord through reinnervation of the adductor muscles for uni lateral vocal cord paralysis. In nine dogs, the adductor branch of the recurrent laryngeal nerve was anastomosed to the main branch of the a nsa cervicalis. Six months later, various techniques of observation sh owed that seven of nine cases had excellent to good adduction during w hining. Adduction was caused by reinnervation of the adductor muscles from the ansa cervicalis as demonstrated by laryngeal spontaneous and evoked electromyography, contraction tension, and various histologic f indings. Therefore, the new technique could be a good treatment of uni lateral vocal cord paralysis.