The Eustachian tube The Eustachian tube, 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 long. It is named after the sixteenth-century anatomist Bartolomeo Eustachi. Some modern medical books … Continue reading The Eustachian Tube