Image Based Question-66179

Which muscle is an abductor of this structure as shown by an arrow in the image?

A. Oblique Arytenoid.

B. Transverse Arytenoid.

C. Lateral Thyroarytenoid.

D. Posterior Cricoarytenoid.

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Correct Answer » D Explanation

Ans;D. Posterior Cricoarytenoid.

This structure is Vocal cord

Muscle which abduct the vocal cord is posterior cricoarytenoid only.

Intrinsic muscles of Larynx

• Divided into respiratory and the phonatory muscles (the muscles of phonation).

• The respiratory muscles move the vocal cords apart and serve breathing.

• The main respiratory muscles are the posterior cricoarytenoid muscles.

• Posterior cricoarytenoid muscles abduct and externally rotate the arytenoid cartilages, resulting in abducted vocal folds.

• The phonatory muscles move the vocal cords together and serve the production of voice. .

• The phonatory muscles are divided into adductors (lateral cricoarytenoid muscles, arytenoid muscles-transverse and oblique ) and tensors (cricothyroid muscles, thyroarytenoid muscles).