Recurrent Laryngeal Nerve

Both Recurrent Laryngeal nerves pass deep to the lower margin of the inferior constrictor muscle to innervate the intrinsic muscles of the larynx responsible for controlling movements of the vocal folds (posterior cricoarytenoid, lateral cricoarytenoid, thyroarytenoid, transverse and oblique arytenoids and vocalis).

Paralysis of the vocal fold results when the inferior laryngeal nerve, a branch of the recurrent laryngeal nerve, is injured. Unilateral lesions typically are not severe. Bilateral lesions cause absence of the voice because the folds cannot be adducted.