Revisiting Eustachian Tube Anatomy and Physiology.

The Eustachian tube (ET) it is a complex structure connecting the middle ear cavity with the nasopharynx. Its function is to maintain middle ear ventilation to facilitate transmission of sound from the tympanic membrane to the cochlea. It is located medial to the parapharyngeal space. The ET and tympanomastoid cavities form an anatomic and functional unit that cannot easily be divided, and it plays a fundamental role in the etiology of different clinical entities. However, the underlying pathophysiological mechanisms are not yet fully understood, and further research is needed to address the gaps present in the literature.