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• W3012912503 abstract "Objectives To determine if the internal branch of the superior laryngeal nerve (iSLN) provides direct motor innervation to the interarytenoid muscle, a laryngeal adductor critical for airway protection. We studied the iSLN‐evoked motor response in the interarytenoid and other laryngeal muscles. If the iSLN is purely sensory, there will be no detectable short latency motor response upon supramaximal stimulation, indicating the absence of a direct efferent conduction path. Study Design Intraoperative case series. Methods In seven anesthetized patients undergoing laryngectomy for unilateral laryngeal carcinoma, the iSLN of the unaffected side was electrically stimulated intraoperatively with 0.1‐ms pulses of progressive intensities until supramaximal stimulation was reached. Electromyographic responses were measured in the ipsilateral interarytenoid, thyroarytenoid, and cricothyroid muscles. Results None of the subjects exhibited short‐latency interarytenoid motor responses to iSLN stimulation. Supramaximal electrical stimulation of the intact iSLN evoked ipsilateral motor responses with long latencies: 18.7–38.5 ms in the interarytenoid (n = 6) and 17.8–24.9 ms in the thyroarytenoid (n = 5). Supramaximal stimulation of the recurrent laryngeal nerve evoked ipsilateral motor responses with short latencies: 1.6–3.9 ms in the interarytenoid (n = 6) and 1.6–2.7 ms in the thyroarytenoid (n = 6). Conclusion The iSLN provides no functional efferent motor innervation to the interarytenoid muscles. The iSLN exclusively evokes an interarytenoid motor response via afferent activation of central neural circuits that mediate the laryngeal reflex arc. These findings suggest that the role of the iSLN in vital laryngopharyngeal functions, such as normal swallowing and protection of the airway from aspiration, is purely sensory. Level of Evidence 4 Laryngoscope , 131:E207–E211, 2021" @default.
• W3012912503 created "2020-03-27" @default.
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• W3012912503 date "2020-03-21" @default.
• W3012912503 modified "2023-10-14" @default.
• W3012912503 title "The Internal Superior Laryngeal Nerve in Humans: Evidence for Pure Sensory Function" @default.
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• W3012912503 doi "https://doi.org/10.1002/lary.28642" @default.
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