Eustachian tube opens in middle ear in
High-Yield Explanation
The anterior wall is narrow due to approximation of the medial and lateral walls, and because of descent of the roof. The uppermost pa of the anterior wall bears the opening of the canal for the tensor tympani. The middle pa has the opening of the auditory tube. the inferior pa of the wall is formed by a thin plate of bone which forms the posterior wall of the carotid canal. the plate separates the middle ear from the internal carotid aery. this plate of bone is perforated by the superior and inferior sympathetic carotico tympanic nerves and the tympanic branch of the internal carotid aery. Ref BDC volume;3 6th edition