<prompt> During a thyroid operation, a nerve coursing along with the superior thyroid artery is injured. What can be the possible consequences?Loss of sensation above vocal cordLoss of sensation below vocal cordParalysis of lateral cricoarytenoid muscleParalysis of cricothyroid muscle  <response>: The nerve coursing along with the superior thyroid artery is external laryngeal nerve branch of superior laryngeal nerve, vagus which supplies cricothyroid muscle. All the muscles of larynx are supplied by recurrent laryngeal nerve, except the cricothyroid muscle.Sensory supply to laryngeal mucosa above vocal cords is by internal laryngeal nerve and below the vocal cords by recurrent laryngeal nerve. 