A narrow passageway that connects the upper part of the throat to the TYMPANIC CAVITY.

A tube connecting the middle ear and the back of the nose that lets air into the middle ear.

A tubular structure that extends from the middle ear to the nasopharynx.

A tubular structure that runs from the middle ear to the nasopharynx and is approximately 3-4 cm length. Its lumen is roughly triangular and has average diameter of 2-3 mm. The lumen is lined by ciliated pseudostratified, columnar epithelium, which sweeps material from the middle ear to the nasopharynx. It is functionally collapsed at rest, with slight negative pressure present in the middle ear, and opens during swallowing, sneezing, and yawning. It serves to ventilate pressure differences between the middle ear and nasopharynx. This tube also allows middle ear secretions to drain into the nasopharynx.

Tube that connects the pharynx to the middle ear space allowing for equalization of pressure across the eardrum.

(pharyngotympanic tube) Organ with organ cavity which connects the cavity of the middle ear to the cavity of the pharynx. Examples: There are only two pharyngotympanic tubes, the right and the left pharyngotympanic tubes.

(pharyngotympanic tube) Organ with organ cavity, each instance of which connects some cavity of middle ear to some cavity of pharynx. Examples: There are only two pharyngotympanic tubes, the right and the left pharyngotympanic tubes.

Eustachian tube, hollow structure that extends from the middle ear to the pharynx (throat). The eustachian tube is about 31-38 mm (1.2-1.5 inches) long in humans and lined with mucous membrane. It is directed downward and inward from the tympanic cavity, or middle ear, to the portion of the pharynx...