<prompt> Cricothyroid muscle is supplied by which nerve?Recurrent laryngeal nerveInternal laryngeal nerveExternal laryngeal nerveGlossopharyngeal nerve  <response>: Ans. is c i.e., External laryngeal nerve Nerve supply of larynx The main cranial nerve innervating the larynx is the vagus nerve via its branches; superior laryngeal nerve SLN and recurrent laryngeal nerve RLN.Sensory supply of larynx Above the level of vocal cords, larynx is supplied by internal laryngeal nerve, a branch of superior laryngeal nerve. Below the vocal cord, larynx is supplied by recurrent laryngeal nerve.Motor supply of larynx All the intrinsic muscles of larynx are supplied by recurrent laryngeal nerve except for cricothyroid muscle. Cricothyroid is supplied by external laryngeal nerve, a branch of superior laryngeal nerve. 