2.ABDUCTOR MUSCLES OF LARYNX:

1.LATERAL CRYCOARYTENOID
2.POSTERIOR CRYCOARYTENOID
3.THYROARYTENOID
4.CRICOTHYROID

ANS:POSTERIOR CRYCOARYTENOID

the only abductor, the posterior cricoarytenoideus muscle. This muscle rotates the arytenoid cartilages laterally (abduct), causing the vocal cords to separate from one another, opening the rima glottidis.