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The leaf has developed posterior attachments that originate from its broadest portion and extend to the arytenoids—the aryepiglottic folds. The quadrangular membrane is the inferior extension of the aryepiglottic fold. Simplistically, the epiglottis is the anterior portion of the supraglottic larynx, the lateral aspects are the aryepiglottic folds and the inferior extension, the quadrangular membrane. The lateral defect in the supraglottic larynx is the laryngeal ventricle. The inferior extent of the quadrangular membrane forms the false cords. The inferior aspect of the supraglottic larynx is defined by a horizontal line passing through the junction of the ventricle with the superior surface of the vocal cords.3 (Used with permission from Wikimedia Commons.) Source: Cancer of the Larynx and Hypopharynx, Textbook of Surgical Oncology Citation: Morita SY, Balch CM, Klimberg V, Pawlik TM, Posner MC, Tanabe KK. Textbook of Surgical Oncology; 2016 Available at: http://mhmedical.com/ Accessed: May 13, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved