The Eustachian tube /juːˌsteɪ.ʃənˈtjuːb/ also auditory tube or pharyngotympanic tube is a tube that links the nasopharynx to the middle ear. It is a part of the middle ear. In adult humans the Eustachian tube is approximately 35 mm (1.4 in) long. It is named after the sixteenth-century anatomist Bartolomeo Eustachi. Some modern medical books call this the pharyngotympanic tube.
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