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!