Superior laryngeal n

The superior laryngeal n. is a branch of the vagus n. (CN X). It descends behind the internal carotid a. and divides into an external laryngeal n. and an internal laryngeal n.  The external laryngeal n. is the motor innervation to the cricothyroid m., and the internal laryngeal n. provides general sensory input from the mucous membranes of the larynx.