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The innervation of the larynx has been a subject of long contention and consequenty we still don't come to a conclusion about detailed findings of laryngeal paralysis.An attempt has been made to observe the movement of the glottis which take place by electrical stimulation of the laryngeal nerves in dog.Swallowing was elicited by repetitive stimulation of the internal branch of the superior laryngeal nerve. At this time the glottis closed, and sphincteric closure of the larynx occured. Electromyogram was recorded during deglutition. The adductor musdes showed many large discharges, however, the posterior cricoarytenoid muscle showed small discharges at the same time.When the both superior laryngeal nerves were stimulated, the vocal cords elongated and were slightly adducted (paramedian position). This fact indicates that adduction of the vocal cords can be obtained by contraction of the cricothyroid muscles.When the both recurrent laryngeal nerves were stimulate at 20/sec. of frequency, abduction of the vorcal cords was observed, and the glottis became wide open (lateral position). If the frequency of stimulation was raised more than 30/sec., the vocal cords were adducted and the glottis was closed. The reason why the laryngeal movement varies according to the frequecy of the stimulation is considerd that tension of the posterior cricoarytenoid becomes already maximum at 20/sec., while more frequencies are needed to get the maximum tension of the adductor muscles.

Movement of the Glottis Induced by Stimulation of the Laryngeal Nerves in Dog