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The Eustachian tube , also called the auditory tube or pharyngotympanic tube, is a tube that links the nasopharynx to the middle ear, of which it is also a part. In adult humans, the Eustachian tube is approximately 35 mm long and 3 mm in diameter. It is named after the sixteenth-century Italian anatomist Bartolomeo Eustachi.

In humans and other tetrapods, both the

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