During deglutition, vocalization, and expiration, the lateral cricoarytenoid muscle enables inward rotation of the arytenoid on the cricoid cartilage, shutting the laryngeal airway.
This activity, which brings the arytenoids together, is enhanced by the interarytenoid muscle. When swallowing, voicing, or exhaling, the lateral cricoarytenoid muscle contracts, causing the arytenoid to rotate inward on the cricoid and closing the laryngeal airway.
The rotation and posterolateral pull of the arytenoid cartilages are caused by the posterior cricoarytenoid muscle contracting. This helps the other intrinsic muscles extend the vocal cords and splits the vocal cords, allowing air to travel through during inspiration and expiration.
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