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 (2025) 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 Print Article Rate This Article