What is posterior cricoarytenoid?

The posterior cricoarytenoid is a muscle located in the larynx, specifically between the cricoid cartilage and the arytenoid cartilage. It plays a crucial role in vocalization and respiration.

The main function of the posterior cricoarytenoid muscle is to abduct or open the vocal cords, allowing for the passage of air into the lungs during inhalation. This muscle is responsible for controlling the tension and positioning of the vocal folds, which affects the pitch and volume of sound produced during speech and singing.

In addition to its role in respiration and vocalization, the posterior cricoarytenoid muscle also helps to protect the airway by preventing the aspiration of food and liquids into the lungs. It is one of the intrinsic muscles of the larynx, along with the other muscles that control vocal cord movement and tension.

Damage or dysfunction of the posterior cricoarytenoid muscle can lead to difficulties in breathing, speaking, and swallowing. In severe cases, such as paralysis of the muscle, it can result in respiratory compromise and impaired vocal function.

Overall, the posterior cricoarytenoid muscle is a vital muscle for normal laryngeal function and plays a crucial role in various aspects of vocalization and respiration.