Which of the following muscle produces abduction of vocal cord?: (A) Posterior cricoarytenoid, (B) Lateral cricoarytenoid, (C) Cricothyroid, (D) Oblique arytenoids
Answer is A. Intrinsic muscles of larynx
 
Exceptions: 1. All are paired except transverse arytenoid
                       2. All lie internally except cricothyroid
A) Muscles which modify rima glottidis