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What is Eustachian tube opens in? and explain in detail?
Ans. is 'b' i.e., Middle ear * Eustachian tube (pharyngotympanic tube) is a channel connecting the tympanic cavity (middle ear cavity) with nasopharynx. Therefore, ear infection can travel to throat through eustachian tube and vice-versa.* Eustachion tube opens into anterior wall (carotid wall) of medial ear.