quadrangular membrane(redirected from Tourtual membrane)
portion of the fibroelastic membrane of the larynx that lies superior to the laryngeal ventricle; its slightly thickened inferior edge, the vestibular ligament, underlies the vestibular fold of the larynx; it attaches anteriorly to the epiglottis and posteriorly to the lateral margin of the arytenoid and corniculate cartilages; its upper portion underlies the mucosa of the aryepiglottic fold, which separates the laryngeal vestibule from the piriform fossa of the laryngopharynx.
The upper portion of the elastic membrane of the larynx extending from the aryepiglottic folds to the level of the ventricular folds below.
See also: membrane
Tourtual,Kaspar, Prussian anatomist, 1802-1865.
Tourtual membrane - the elastic fibra membrane that extends from the ventricular fold of the larynx upward to the aryepiglottic fold. Synonym(s): quadrangular membrane
Tourtual sinus - the interval between the palatoglossal and palatopharyngeal arches above the tonsil, most obvious after the tonsil has regressed in the adult. Synonym(s): supratonsillar fossa