<prompt> A patient met with recurrent laryngeal nerve palsy while undergoing thyroid surgery. Which of the following muscles of larynx isare affected?Posterior crioarytenoidLateral cricoarytenoidThyroarytenoidAll  <response>: All muscles which move the vocal cord abductors, adductors or tensors are supplied by the recurrent laryngeal nerve except the cricothyroid muscle which is supplied by external laryngeal nerve a branch of superior laryngeal nerve. 