Which muscle abducts the vocal folds in ABSD?

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Multiple Choice

Which muscle abducts the vocal folds in ABSD?

Explanation:
Abduction of the vocal folds is accomplished by the posterior cricoarytenoid muscle. It runs from the posterior cricoid to the arytenoid and, when it contracts, rotates the arytenoid cartilages outward, pulling the vocal folds apart to open the glottis for air flow. This makes it the primary (and essentially the only intrinsic) abductor. The lateral cricoarytenoid and interarytenoids adduct the vocal folds (bringing them together), while the thyroarytenoid helps adjust tension and length and does not mainly abduct. So, for opening the glottis in ABSD, the posterior cricoarytenoid is the correct muscle.

Abduction of the vocal folds is accomplished by the posterior cricoarytenoid muscle. It runs from the posterior cricoid to the arytenoid and, when it contracts, rotates the arytenoid cartilages outward, pulling the vocal folds apart to open the glottis for air flow. This makes it the primary (and essentially the only intrinsic) abductor. The lateral cricoarytenoid and interarytenoids adduct the vocal folds (bringing them together), while the thyroarytenoid helps adjust tension and length and does not mainly abduct. So, for opening the glottis in ABSD, the posterior cricoarytenoid is the correct muscle.

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