Abstract:It is not uncommon for patients with postoperative pronunciation changes caused by the injury of the external branch of the superior laryngeal nerve during thyroid surgery, but compared with the recurrent laryngeal nerve, the intraoperative identification and protection of the external branch of the superior laryngeal nerve has not attracted enough attention. The external branch of the superior laryngeal nerve is slender and anatomically varied, which makes it difficult to identify the external branch of the superior laryngeal nerve with vision during operation. Intraoperative neuromonitoring technology is considered to be efficient, reliable and safe to identify nerves, and has been gradually applied to the intraoperative monitoring of the external branches of the superior laryngeal nerve during thyroid surgery, effectively reducing the injury rate of the external branches of the superior laryngeal nerve and the risk of patients' pronunciation changes.