Posterior Cricoarytenoid

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 1
  Superior view of the intrinsic muscles of the larynx.