[Experimental study on the reinnervation of the vocal cord adductor by implantation of ansa cervicalis].

The sub-branches of main branch of ansa cervicalis were cut and implanted into the thyroarytenoid and lateral cricoarytenoid muscles on the left side in 7 dogs after the recurrent and superior laryngeal nerves were sectioned on the same side. After six months, laryngoscopy showed that adduction of the vocal cord recovered in five post-operative cases. Adduction was caused by the reinnervated adductor muscles, as demonstrated by laryngeal electromyography, histologic studies, tension of contraction and electron microscopy for the neuro-muscular junctions. The present results demonstrated that the procedure seemed to produce satisfactory reinnervation of the adductor musculature.