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The narrow Eustachian tube is part of the contiguous system that includes the nose, palate, and nasopharynx. The nasopharynx is proximal to the eustachian tube, and the middle ear and mastoid are located at its distal end. Directed downward, forward, and medially from the middle ear, the Eustachian tube opens approximately 1.25 cm behind and just below the posterior end of the inferior turbinate.