posterior cricoarytenoid muscle

The main respiratory muscles are the posterior cricoarytenoid muscles.

(Their action is antagonistic to that of the posterior cricoarytenoid muscles.)

Posterior cricoarytenoid muscles abduct and externally rotate the arytenoid cartilages, resulting in abducted vocal folds.

Cytochrome c Oxidase Deficiency in Human Posterior Cricoarytenoid Muscle.

The posterior cricoarytenoid muscles receive innervation from the recurrent laryngeal branch of the vagus nerve (CN X).

The posterior cricoarytenoid muscles are extremely small, paired muscles that extend from the posterior cricoid cartilage to the arytenoid cartilages in the larynx.

Paralysis of the posterior cricoarytenoid muscles may lead to asphyxiation as they are the only laryngeal muscles to open the true vocal folds, allowing inspiration and expiration.

The experiment was made by attaching electrodes to the cricothyroid muscle and the posterior cricoarytenoid muscle and measuring EMG signals.

Not to be confused with the posterior cricoarytenoid muscles, which are the only muscles directly responsible for opening (abducting) the space between the vocal cords to allow for sound production.

The function of the cricoid cartilage is to provide attachments for the cricothyroid muscle, posterior cricoarytenoid muscle and lateral cricoarytenoid muscle muscles, cartilages, and ligaments involved in opening and closing the airway and in speech production.

The lateral angle of the base of the arytenoid cartilage is short, rounded, and prominent; it projects backward and lateralward, and is termed the muscular process; it gives insertion to the posterior cricoarytenoid muscles behind, and to the lateral cricoarytenoid muscles in front.