1. Watch how the CT muscle closes the space between the thyroid and cricoid cartilages, elongating the vocal folds and allowing us to change pitch! | 3. Now watch how the activation of the Posterior Cricoarytenoid (PCA) abducts (opens) the vocal folds! |
2. Watch how the combination of the Lateral Cricoarytenoid (LCA) and Interarytenoids (IA) works to close the glottis! | 4. Watch how the arytenoids are able to rock anterior-posteriorly, and medial-laterally, as well as turn in and out! |