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Figure 11. Normal IAC. Coronal (top left), sagittal (top right), and axial (bottom left) VR CT images show the normal IAC (arrow). Virtual IAC otoscopic image (bottom right) shows the fundus of the IAC, which is divided into upper and lower portions by the falciform crest (FCr). The Bill bar (BB) further subdivides the upper portion of the fundus into openings for the facial nerve (FN) anteriorly and the superior vestibular nerve (SV) posteriorly. The lower portion of the fundus contains an anterior opening for bundles of the cochlear nerve (CN) and a pinpoint posterior opening for the inferior vestibular nerve (IV).
