<Tr> <Th> FMA </Th> <Td> 9705 </Td> </Tr> <Tr> <Td_colspan="2"> Anatomical terminology (edit on Wikidata) </Td> </Tr> <P> The Eustachian tube, also known as the 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 and 3 mm (0.12 in) in diameter . It is named after the sixteenth - century anatomist Bartolomeo Eustachi . </P> <P> In humans and other land animals the middle ear (like the ear canal) is normally filled with air . Unlike the open ear canal, however, the air of the middle ear is not in direct contact with the atmosphere outside the body . The Eustachian tube connects from the chamber of the middle ear to the back of the nasopharynx . </P>

What structure connects the middle ear to the nasopharynx