Lateral cricoarytenoid muscle

Lateral cricoarytenoid muscle
Lateral cricoarytenoid
Musculuscricoarytenoideuslateralis.png
Muscles of larynx. Side view. Right lamina of thyroid cartilage removed.
Latin musculus cricoarytenoideus lateralis
Gray's subject #236 1082
Origin lateral part of the arch of the cricoid
Insertion    muscular process of the arytenoid cartilage
Artery
Nerve recurrent laryngeal branch of the vagus
Actions adduct and medially rotate the cartilage, pulling the vocal ligaments towards the midline and backwards and so closing off the rima glottidis
Antagonist Posterior cricoarytenoid muscle

The lateral cricoarytenoid (also anterior cricoarytenoid) muscles extend from the lateral cricoid cartilage to the ipsilateral arytenoid cartilage. By rotating the arytenoid cartilages medially, these muscles adduct the vocal cords and thereby close the rima glottidis, protecting the airway. (Their action is antagonistic to that of the posterior cricoarytenoid muscles.) The lateral cricoarytenoid muscles receive innervation from the recurrent laryngeal branch of the vagus nerve (CN X).

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