Which is the only muscle that is located on the external aspect of larynx?

Cricothyroid is the only muscle that is located on the external aspect of larynx. it is supplied by the external laryngeal nerve. It is a tensor and mild adductor of the vocal cord. Abductor of vocal cord: Posterior cricoarytenoid Adductors of vocal cord are: Cricothyroid Thyroarytenoids Lateral cricoarytenoid Transverse arytenoids Relaxant of vocal cords: Vocalis Thyroarytenoid