Due to anatomical relationships, cervical nerve injury often occurs simultaneously with vascular injury. The higher the injury location, the more multiple nerves are injured; in the middle and lower neck segments, single nerve injury is more common. In combined facial and neck injuries, nerve injury accounts for 10% to 15%. Among them, injuries to the brachial plexus, spinal cord, recurrent laryngeal nerve and vagus nerve are more common. The superior laryngeal nerve comes from the nodose ganglion of the vagus nerve, which is located close to the jugular foramen and is divided into internal and external branches on the hyoid plane. The external branch often runs closely with the superior thyroid artery on the way down, generally located in front of the superior thyroid artery. According to Moosman's 200 autopsy, 21% of the external branches have an uncertain direction, 15% are located in the thyroid sheath, and 6% are located between the branches of the superior thyroid artery. According to Meng Zhaohui et al. (1976)'s observation of laryngeal nerve anatomy, the superior laryngeal nerve and the superior thyroid artery are closely accompanied, of which 89.3% of the nerves run behind the superior thyroid artery, 6.7% are in front of the artery, and 4% are between the branches of the artery.