Interarytenidmusklernas

Interarytenidmusklerna, also known as the transverse arytenoid muscles, are a pair of intrinsic muscles of the larynx. They originate from the lateral surfaces of the posterior arytenoid cartilages and insert onto the contralateral lateral surfaces of the posterior arytenoid cartilages. Therefore, they run transversely across the posterior larynx, connecting the two arytenoid cartilages.

The primary function of the interarytenoid muscles is to adduct (bring together) the arytenoid cartilages. This action is crucial for closing the glottis, the space between the vocal folds. When these muscles contract, they pull the vocal folds towards the midline, effectively narrowing or completely closing the rima glottidis. This adduction is essential for several laryngeal functions, including voice production (phonation), preventing aspiration of food and liquid into the trachea during swallowing, and increasing intrathoracic pressure for activities like coughing or heavy lifting.

The interarytenoid muscles are innervated by the recurrent laryngeal nerve, a branch of the vagus nerve. Their coordinated action with other laryngeal muscles, such as the lateral cricoarytenoid muscles, allows for precise control over vocal fold tension and position, which is fundamental for producing a wide range of sounds and protecting the airway. Dysfunction of these muscles can lead to voice impairments and difficulties with airway protection.