<prompt> Which of the following muscle is supplied by external laryngeal nerve which is a branch of superior laryngeal nervePosterior cricoarytenoidCricothyroidLateral cricoarytenoidThyroarytenoid  <response>: Cricothyroid 337, 358-DActing on vocal cords Abductors: Posterior cricoarytenoid Adductors: lateral cricoarytenoid; Interarytenoid Transverse arytenoid; Thyroarytenoid external part Tensors: Cricothyroid; Vocalis internal part of thyroarytenoid All the muscles which move the vocal cord abductors, adductors or tensors are supplied by the recurrent laryngeal nerve except the cricothyroid. Cricothyroid receives its innervations from the external laryngeal nerve - a branch of superior laymgeal nerve Trottlers or sinus of Morgagni syndrome or Triad - seen in nasopharyngeal carcinoma i Conductive hearing loss ii Ipsilateral immobility of soft palate iii Neuralgic pain in the distribution of V3 