Abstract

Changes in the laryngeal reflex were estimated after the cough reflex induced by repetitive stimulation (30 Hz) to the internal branch of the superior laryngeal nerve (iSLN) in ketamine-anesthetized cats. TThe laryngeal reflex was induced by a single iSLN stimulation (0.5 Hz). The magnitude of the laryngeal reflex in the thyroarytenoid muscle increased to about 200% of its level before the cough reflex. This significant increase continued for about 150 s after the cough reflex. These results suggest that the excitability of the motoneurons innervating the laryngeal adductor muscles is increased after the cough reflex.

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