Nihon Jibiinkoka Gakkai kaiho
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Nippon Jibiinkoka Gakkai Kaiho · Jul 1990
[A physiological study of the effect of vibration on reflexive control of cats' larynx: the changes in respiratory phase and the role of internal branch of superior laryngeal nerve].
It is generally considered that the vocal cord is finely and reflexively controlled during phonation. In order to investigate the effect of vibratory stimulation of the subglottis on laryngeal reflex, experiments have been performed using cats' larynx under urethane-chloralose general anesthesia. The effect of vibration was estimated by the latency and the area of integrated EMG of the reflex. ⋯ The vibratory effects disappeared soon after local anesthesia of the subglottic mucosa. These results suggest that the activity of the mechanoreceptors to vibration in the subglottic mucosa enhances reflexive contraction of the contralateral TA primarily via the recurrent laryngeal nerve and partially via ISLN, both of which are indispensable for reflexive laryngeal control. It is conceivable that early response is one of the primitive reflexes for the protection of the lower airway, and late response is a sort of more evolved reflexes involved in vibration and respiration during phonation.