<prompt> Abductor of the vocal cord is: RepeatLateral cricoarytenoidCricothyroidPosterior cricoarytenoidInterarytenoid  <response>: Ans: C Posterior cricoarytenoid Ref: Diseases of the Ear Nose and Throat by PL Dhingra 5th edn .2010. Page 300Explanation:Muscles of the larynx are divided into intrinsic and extrinsic groupsIntrinsic muscles of the larynx areThose acting on the vocal cordAbductors - Posterior cricoarytenoidAdductors - Lateral cricoarytenoidInterarytenoidThyroarytenoidTensors - External - CricothyroidInternal - VocalisThose acting on the laryngeal inletOpening the inlet - Thyroepiglottis Part of thyroarytenoidClosing the inlet -Interarytenoid oblique partAryepiglottic posterior oblique part of interarytenoidExtrinsic muscles of the larynx ElevatorsPrimary-Stylopharyngeus, Salphingophar- yngeus, Palatopharvngeus ThyrohyoidSecondary - Mylohyoid, Stylohyoid, Digastric, GeniohyoidDepressorsSternohyoid, sternothyroid, omohyoid 