Internal Auditory Canal (IAC)
It must be understood that the medial wall of the vestibule forms the lateral wall of the internal auditory canal. Therefore, a small amount of bone removal is sufficient to unroof the internal auditory canal at its anterior (lateral) end, the fundus. Posteriorly, the route to the porus acusticus (the medial end of the canal) is much deeper because the canal is slanting away from the fundus to the porus. The IAC is in the same axis as the external auditory canal. It has a much more acute angle (more vertical) than most trainees expect.
KeywordsSemicircular Canal External Auditory Canal Internal Auditory Canal Jugular Bulb Posterior Semicircular Canal
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