What muscles are responsible for laryngospasm?

The correct choice is the lateral cricoarytenoids. These muscles play a crucial role in the function of the larynx, particularly in adducting the vocal cords. During a laryngospasm, the vocal cords close involuntarily, which can restrict airflow and lead to symptoms of breathlessness. The lateral cricoarytenoid muscles are specifically responsible for this adduction action, causing the vocal cords to come together tightly, which contributes to the mechanism of laryngospasm.

Understanding the roles of the muscles associated with the larynx can help clarify their function in various respiratory events. The posterior cricoarytenoid muscles, for example, are responsible for abducting the vocal cords, which makes them more relevant in conditions where airway opening is needed rather than closure. The thyroarytenoids and vocalis muscles are involved in modifying tension and length of the vocal cords for sound production, but they do not play a primary role in triggering or contributing to laryngospasm. Thus, the lateral cricoarytenoids are the key players in this specific physiological response.