Epiglottis

The epiglottis is a lidlike cartilaginous structure overhanging the entrance to the larynx, which can close like a lid over the trachea to prevent the airway from receiving any food or liquid being swallowed. It projects obliquely upwards behind the tongue and the hyoid bone, pointing dorsally. The term, like tonsils, is often incorrectly used to refer to the uvula. There are taste buds on the epiglottis. The epiglottis guards the entrance of the glottis, the opening between the vocal folds. It is normally pointed upward while one is breathing with its underside functioning as part of the pharynx, but while one is swallowing, elevation of the hyoid bone draws the larynx upward; as a result, the epiglottis folds down to a more horizontal position, with its superior side functioning as part of the pharynx. In this manner it prevents food from going into the trachea and instead directs it to the esophagus, which is posterior. The epiglottis is one of nine cartilaginous structures that make up the larynx (voice box). While one is breathing, it lies completely within the pharynx. When one is swallowing it serves as part of the anterior of the larynx.

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