Thursday, February 17, 2005

Ear, Human, Eustachian tube

The eustachian tube, about 45 millimetres (1.75 inches) long, leads downward and inward from the tympanum to the nasopharynx, the space that is behind and continuous with the nasal passages and is above the soft palate. At its upper end the tube is narrow and surrounded by bone. Nearer the pharynx it widens and becomes cartilaginous. Its mucous lining, which is continuous with


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