The hyoepiglottic ligament is a short elastic band connecting the anterior surface of the epiglottis to the posterior surface of the body of the hyoid bone, crossing the pre-epiglottic space. It suspends the epiglottis from the hyoid and limits inferior displacement of the epiglottis. The vallecular space is formed between the hyoepiglottic ligament superiorly, the base of tongue, and the lingual surface of the epiglottis.
Suspends and anchors the epiglottis to the hyoid bone, limiting excessive inferior epiglottic descent, maintaining the pre-epiglottic space geometry, and contributing to epiglottic movement coordination during swallowing.
The hyoepiglottic ligament is a landmark in laryngoscopy and intubation: the epiglottis tip is stabilised by this ligament when the laryngoscope blade is advanced into the vallecula and levered anteriorly (indirect approach), compressing the hyoepiglottic ligament to rotate the epiglottis anteriorly and expose the glottis. Epiglottitis causes oedema of the supraglottic structures including the epiglottic folds and the pre-epiglottic space, with potential obstruction at the hyoepiglottic ligament level.
Advancing the Macintosh laryngoscope blade into the vallecula and lifting anteriorly compresses the hyoepiglottic ligament, transmitting force to rotate the epiglottis upward and expose the glottis for orotracheal intubation; inadequate vallecula depth or a stiff hyoepiglottic ligament in obese patients may limit this mechanism, requiring a Miller straight blade placed directly under the epiglottis instead.
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