The laryngeal ventricle, (also called the ventricle of the larynx, laryngeal sinus, or Morgagni's sinus)[1] is a fusiform fossa, situated between the vestibular and vocal folds on either side, and extending nearly their entire length.

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.

It runs between the vestibular fold, thyroarytenoid muscle, and thyroid cartilage, and is conical, bending slightly backward.

The muscles surrounding the appendix compress it until mucus is secreted to lubricate the vocal folds.

This article incorporates text in the public domain from page 1080 of the 20th edition of Gray's Anatomy (1918)