<prompt> All of the following muscles are derived from 6th brachial arch EXCEPT:Lateral cricoarytenoidPosterior cricoarytenoidInterarytenoidCricothyroid  <response>: Ans. d CricothyroidRef: LB. Singh 9th ed. 116 Cricothyroid muscle is derived from fourth branchial arch. It is the only intrinsic laryngeal muscle not derived from 6th branchial arch Nerve supply: Superior laryngeal nerve 