The Eustachian tube was closed.
"Anomalies and Curiosities of Medicine" by George M. Gould
I fear that the Eustachian tube question must have cost you a deal of labour; it is quite a complete little essay.
"The Life and Letters of Charles Darwin, Volume II (of II)" by Charles Darwin
I fear you will think me very troublesome, especially when I remind you (not that I am in a hurry) about the Eustachian tube.
"More Letters of Charles Darwin Volume II" by Charles Darwin
There are also little openings, one on each side, from which begin the Eustachian tubes, which lead upward to the ear cavities.
"A Practical Physiology" by Albert F. Blaisdell
The inflammatory process then extended to the Eustachian tubes.
"Beethoven" by George Alexander Fischer
Orifice of the Eustachian tube.
"The People's Common Sense Medical Adviser in Plain English" by R. V. Pierce
It forms the Eustachian tube in all other Tetrapoda.
"Form and Function" by E. S. (Edward Stuart) Russell
The Eustachian valve was small, that of Thebesius imperfect.
"Journal of the Proceedings of the Linnean Society - Vol. 3" by Various
Cut off lower jaw, and note posterior nares and Eustachian openings.
"Text Book of Biology, Part 1: Vertebrata" by H. G. Wells
This in the large majority of cases will subside and drain back again into the throat through the Eustachian tube.
"Preventable Diseases" by Woods Hutchinson