ENT General 156c2d1c Closure of glottis is by, all except - A Posterior cricoarytenoids B Lateral cricoarytenoids C Cricothyroid D Thyroarytenoids High-Yield Explanation Muscles which adduct the vocal cords (close the glottis) are thyroarytenoid, lateral cricoarytenoid, Interarytenoid (Transverse arytenoid), Cricothyroid.