The synchronous electromyography of the extrinsic laryngeal muscles (sternohyoid muscle, sternothyroid muscle and thyrohyoid muscle) and thyroarytenoid muscle of dogs was analyzed in this study. The result showed that the electrical activity of the thyrohyoid muscle were synchronous to that of the thyroaryienoid muscle during quiet respiration, deep inspiration, phonation and swallowing. The discharge of the sternohyoid muscle was recorded during expiration and phonation. The electrical activity of the sternothyroid muscle was also recorded during inspiration and phonation, and was increased during deep inspiration. The study suggests that reinnervation of the thyroarytenoid muscle from thyrohyoid branch of the ansa cervicalis for functional rehabilitation could fit well the physiological characteristic of the larynx.
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