Which muscle is the medial belly of the thyroarytenoid (TA)?

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Multiple Choice

Which muscle is the medial belly of the thyroarytenoid (TA)?

Explanation:
The inner, or medial portion of the thyroarytenoid muscle is the thyrovocalis. This part lies closest to the vocal folds and acts as the main tense component of the vocal fold, attaching to the vocal ligament and helping to increase tension when it contracts. The thyroarytenoid as a whole has two parts: the medial thyrovocalis that tightens the cords, and the lateral thyromuscularis that can adjust tension by moving the thyroid and arytenoid cartilages. The cricothyroid is a separate muscle that also increases tension by tilting the thyroid forward, while the arytenoid is a cartilage, not a muscle.

The inner, or medial portion of the thyroarytenoid muscle is the thyrovocalis. This part lies closest to the vocal folds and acts as the main tense component of the vocal fold, attaching to the vocal ligament and helping to increase tension when it contracts. The thyroarytenoid as a whole has two parts: the medial thyrovocalis that tightens the cords, and the lateral thyromuscularis that can adjust tension by moving the thyroid and arytenoid cartilages. The cricothyroid is a separate muscle that also increases tension by tilting the thyroid forward, while the arytenoid is a cartilage, not a muscle.

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