Pathogenesis Dysfunction of Eustachian tube a obstruction of Eustachian tube Mechanic obstruction u enlarged adenoid tumor enlarged inferior turbinate Non mechanic obstruction a Weakness of related muscl Clearance and defense Immotile cilia syndrome 1. Eardrum rcutar canals B Vestibular nerve Note Eustachian tubePathogenesis ◼ Dysfunction of Eustachian tube ◼ Obstruction of Eustachian tube ◼ Mechanic obstruction ◼ enlarged adenoid, tumor, enlarged inferior turbinate ◼ Non mechanic obstruction ◼ Weakness of related muscle, ◼ Clearance and defense ◼ Immotile cilia syndrome