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The long axis of the internal auditory canal (IAC) is oriented superior and parallel to the external auditory canal (EAC) (Fig. 5.1). Its most lateral extent is superficially located, deep to the medial wall of the vestibule, whereas its most medial extent (porus) is deep to bone at the medial junction of the middle and posterior fossae. The jugular bulb and cochlear aqueduct, identified by the efflux of CSF, form the boundary for the most inferior limit of the dissection.

Fig. 5.1 Parallel orientation of the internal and external auditory canals.

Fig. 5.2 Transverse crest at the fundus of the IAC.

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