The posterior cricoarytenoid is an intrinsic muscle of the larynx. It is the only muscle able to widens the space between the vocal folds.
- Attachments: Originates from the posterior surface of the cricoid cartilage and attaches to the muscular process of the arytenoid cartilage.
- Actions: Abduction of the vocal folds
- Innervation: Inferior laryngeal nerve (branch of recurrent laryngeal).
- Blood Supply: Laryngeal banches of the superior and inferior thyroid arteries.