Transverse arytenoid: attach opposite posterior surface of the arytenoid cartilage. It draws arythenoid nearer to each other and adduct the vocal folds. Oblique arytenoid: pass from muscular process of one to the apex of the opposite arytenoid. Crosses each other on the posterior surface of the transverse arythenoid. It has the same action as the transverse. Some fibres continue from the arytenoid to the epiglottis which is the aryepiglottic muscle. Posterior cricoarytenoid: arise from concavity