Which muscle forms the lateral belly of the thyroarytenoid (TA)?

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Multiple Choice

Which muscle forms the lateral belly of the thyroarytenoid (TA)?

Explanation:
The thing being tested is how the thyroarytenoid muscle is organized. The thyroarytenoid actually has two portions that form the body of the vocal fold: a medial part called the thyrovocalis (the vocalis) and a lateral part called the thyromuscularis. The lateral belly of the thyroarytenoid is the thyromuscularis. The other muscles listed are different muscles with distinct roles (for example, the thyrovocalis is the medial portion, the cricothyroid lengthens/tenses the vocal folds, and the lateral cricoarytenoid adducts the vocal folds). So, the muscle forming the lateral belly is the thyromuscularis.

The thing being tested is how the thyroarytenoid muscle is organized. The thyroarytenoid actually has two portions that form the body of the vocal fold: a medial part called the thyrovocalis (the vocalis) and a lateral part called the thyromuscularis. The lateral belly of the thyroarytenoid is the thyromuscularis. The other muscles listed are different muscles with distinct roles (for example, the thyrovocalis is the medial portion, the cricothyroid lengthens/tenses the vocal folds, and the lateral cricoarytenoid adducts the vocal folds). So, the muscle forming the lateral belly is the thyromuscularis.

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