[Experimental studies on the selective reinnervation of the abductor and adductor muscles of the larynx].

Fifteen adult dogs were divided into three groups randomly in the experiment. Function rehabilitation of the adduction and abduction after vocal cords paralysis was attempted by selective reinnervation of the laryngeal muscles. Observation showed: onset of recovery of spontaneous adduction was 3 months following surgery, whereas onset of spontaneous abduction was 4 months postoperatively, all experimental animals except control group successfully regained synchronous adduction and abduction in 6 months after operation. Electromyography, tension of contraction of laryngeal muscles and histology studies were performed at 6 months postoperatively. The results demonstrated that it was possible and successful to reinnervate the adductor and abductor muscles of the larynx. Moreover, the delay of reinnervation of laryngeal muscles is discussed in the article.