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Quadrangular Membrane
Respiratory System

Quadrangular Membrane

Membrana quadrangularis

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Structure

The superior margin of the quadrangular membrane extends from the epiglottis anteriorly to the arytenoid cartilages posteriorly. Due to the position of these cartilages, the anterior border slopes inferiorly as it courses towards the arytenoid cartilages.

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Key Features & Anatomical Relations

The quadrangular membrane hangs like a curtain with a free lower border. This free lower margin is thickened and forms the vestibular ligament which is the basis of the vestibular fold.

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