Posterior Cricoarytenoid - Podcast Version 0:00 / 0:00 1x 0.25x 0.5x 0.75x 1x 1.25x 1.5x 1.75x 2x 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. By TeachMeSeries Ltd (2026) Fig 1Superior view of the intrinsic muscles of the larynx. Pro Feature - 3D Model You've Discovered a Pro Feature Access our 3D Model Library Explore, cut, dissect, annotate and manipulate our 3D models to visualise anatomy in a dynamic, interactive way. Learn More Frequent questions What is the function of the posterior cricoarytenoid muscle? The posterior cricoarytenoid muscle is the only muscle responsible for abducting the vocal folds, which widens the space between them. This action is crucial for proper breathing and phonation. Where does the posterior cricoarytenoid muscle originate and insert? It originates from the posterior surface of the cricoid cartilage and inserts into the muscular process of the arytenoid cartilage. This specific attachment allows it to effectively control vocal fold movement. What nerve innervates the posterior cricoarytenoid muscle? The posterior cricoarytenoid muscle is innervated by the inferior laryngeal nerve, which is a branch of the recurrent laryngeal nerve. This innervation is essential for its motor function in the larynx. How is the blood supply to the posterior cricoarytenoid muscle provided? The blood supply to the posterior cricoarytenoid muscle comes from the laryngeal branches of both the superior and inferior thyroid arteries. This vascular supply supports the muscle's metabolic needs during its activities. Why is the posterior cricoarytenoid muscle clinically significant? The posterior cricoarytenoid muscle is clinically significant because it is the sole muscle that abducts the vocal folds, impacting airway management and voice production. Dysfunction can lead to respiratory difficulties and voice disorders. Rate This Article