Anatomy

Origin

It arises from the upper border of the arch of the cricoid cartilage.   

Insertion

Passing obliquely upward and backward, is inserted into the front of the muscular process of the arytenoid cartilage.    

Nerve

Recurrent Laryngeal Nerve (Branch of the Vagus nerve, CN X).

Actions

The Cricoarytœnoidei laterales close the glottis by rotating the arytenoid cartilages inward, so as to approximate their vocal processes.