The fossa is bounded, above, by the free crescentic edge of the vestibular ligament; below, by the straight margin of the vocal fold and laterally, by the mucous membrane covering the corresponding thyroarytenoid muscle.
2.
It is to the vestibular ligaments ( vestibular folds once covered with mucous membrane ) what the rima glottidis is to the vocal ligaments ( vocal folds once covered with mucous membrane )-the space formed when the folds are separated.
3.
It is the inlet to another cavity in the lateral wall of larynx, the laryngeal ventricle . The vestibular fold is formed by the vestibular ligament extending from the lateral walls of the epiglottis to the arytenoid cartilage covered with mucous membrane.
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