eustachian tube,hollow structure that extends from the middle ear to thepharynx (throat). The eustachian tube is about 31–38 mm (1.2–1.5 inches) long in humans and lined withmucous membrane. It is directed downward and inward from the tympanic cavity, or middle ear, to the portion of the pharynx called the nasopharynx (the space above the softpalate and behind and continuous with the nasal passages). The upper end of the eustachian tube is narrow and surrounded bybone. As it nears the pharynx, the tube becomes wider and cartilaginous. The mucous lining is continuous with that of the middle ear.Cilia (small hairlike projections) cover it to aid the drainage of mucous secretions from the middle ear to the pharynx.

The main function of the eustachian tube is ventilation of the middle ear and maintenance of equalized air pressure on both sides of thetympanic membrane (eardrum). Closed at most times, the tube opens during swallowing. This permits equalization of the pressure withoutconscious effort. During an underwater dive or a rapid descent in an airplane, the eustachian tube may remain closed in the face of rapidly increasing surrounding pressure. The pressure on both sides of the eardrum membrane can usually be equalized by holding the nose and blowing, by swallowing, or by wiggling thejaws.