The interaction of the laryngeal muscles and the movement of which cartilage causes changes in the tension on the vocal cords, allowing phonation?
a. Arytenoids
b. Corniculates
c. Cricoid
d. Cuneiforms
ANS: A
The laryngeal component of speech is called phonation. It requires the adjustment of vocal cord tension and position relative to one another. The action of the posterior cricoarytenoid muscles causes the arytenoid cartilages to rotate and opens the vocal cords. Closure of the vocal cords is carried out by rotating the arytenoids in the opposite direction through the action of the lateral cricoarytenoid and oblique arytenoid muscles.
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