Infraglottic cavity extends from rima glottidis to the lower border of the cricoid cailage. The rima glottidis is the space between the vocal folds and arytenoid cailages. Vestibule extends from the laryngeal inlet to the vestibular folds. Ventricle extends between vestibular fold and the vocal fold. Piriform recess is a pear-shaped fossa in wall of the laryngopharynx lateral to the arytenoid cailage.