Lateral cricoarytenoid muscle

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Lateral cricoarytenoid
Muscles of larynx. Side view. Right lamina of thyroid cartilage removed.
Origin lateral part of the arch of the cricoid
Insertion muscular process of the arytenoid cartilage
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
Latin Musculus cricoarytaenoideus lateralis
TA A06.2.08.006
FMA 46579
Anatomical terms of muscle

The lateral cricoarytenoid (also anterior cricoarytenoid) muscles extend from the lateral cricoid cartilage to the muscular process of the 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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