Posterior Cricoarytenoid

Written by Roxanne Salkeld

Last updated February 1, 2023 • 7 Revisions

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.

    Fig 1
    Superior view of the intrinsic muscles of the larynx.

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