The External Laryngeal Nerve is a motor nerve, innervating the cricothyroid muscle and part of the transverse arytenoid muscle.
喉上神经外侧支为运动神经,支配环甲肌和部分杓横肌。
英语百科
Cricothyroid muscle
The cricothyroid muscle is the only tensor muscle of the larynx aiding with phonation. It attaches to the anterolateral aspect of the cricoid and the inferior cornu and lower lamina of the thyroid cartilage, and its action tilts the thyroid forward to help tense the vocal cords. Not to be confused with the posterior cricoarytenoid muscles, which are the only muscles directly responsible for opening (abducting) the space between the vocal cords to allow for respiration.