It is involved in the upper respiratory system.
Eustachian tubes are part of our auditory system their function is to equalize pressure on both sides of our ear drum so that it can vibrate freely.
The Eustachian tubes
eustachian tubes
The Eustachian tubes are in the respiratory system. They connect the throat to the middle ear by way of two narrow tunnels that help equalize air pressure.
eustachian tube
Those are called the Eustachian tubes.
Eustachian tubes
Nasopharynx
The eustachian tubes are the auditory tubes that link the nasopharynx to the middle ear.
Salpingostenosis is the medical term meaning abnormal narrowing of the eustachian tube. The breakdown is salpingo- (tube - usually eustachian or fallopian) and -stenosis (abnormal narrowing).
Pharynx and inner ear
Eustachian tube.