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The posterior cricoarytenoid muscle receives motor innervation from (the anterior division of) the recurrent laryngeal nerve (itself a branch of the vagus nerve (CN X)). [2] [5] Different parts of the muscle (such as the medial and lateral muscle bellies) are often innervated by separate branches. [2] There may be 1-6 branches, but are usually 2-3.
[15] [a] These muscles act to open, close, and adjust the tension of the vocal cords, and include the posterior cricoarytenoid muscles, the only muscle to open the vocal cords. [16]: 10–11 The nerves supply muscles on the same side of the body, with the exception of the interarytenoid muscle, which is innervated from both sides. [15]
Cricoarytenoid muscles are muscles that connect the cricoid cartilage and arytenoid cartilage. More specifically, it can refer to: Posterior cricoarytenoid muscle
The rima glottidis is closed by the lateral cricoarytenoid muscles and the arytenoid muscle, and opened by the posterior cricoarytenoid muscles.All of these muscles receive innervation from the recurrent laryngeal nerve which is a branch of the vagus nerve (CN X).
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. [citation needed]
The cricoarytenoid joint allows for rotation and gliding motion. [1] The extent of rotation is significant, while the extent of gliding is limited. [1] The cricoarytenoid joint controls the abduction and adduction of the vocal cords. [1] It is moved by many of the intrinsic muscles of the larynx. [2]
The posterior cricoarytenoid (PCA) is a muscle of the larynx that is responsible for pulling the vocal folds apart from one another. [5] Vocal fold paresis describes the weakness of the PCA and an impairment to its functioning. [22] Unilateral vocal fold paresis is the term used when there is damage to the RLN on one side of the body. [7]
The lateral process is the attachment of one of the major intrinsic muscles of the vocal folds and consequently named the muscular process. [ 1 ] As the concave bases of the arytenoid cartilages move on the two convex articular surfaces on the cricoid cartilage (at the cricoarytenoid articulations ), the vocal processes are brought closer to ...