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Fundus of the Right Internal Auditory Meatus

Surgical Correlation

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Fundus of the Right Internal Auditory Meatus. The transverse crest divides the meatal fundus into superior and inferior parts. Above the transverse crest, the facial canal is anterior and the superior vestibular area is posterior. The facial canal and the superior vestibular area are separated by the vertical crest (Bill’s Bar). Below the transverse crest, the cochlear area is anterior and the inferior vestibular area is posterior. The singular foramen, through which the singular branch of the inferior vestibular nerve passes to innervate the posterior canal ampullae, is located posterior to the inferior vestibular area. The inferior vestibular nerve also has a saccular and, occasionally, a utricular branch. (Image courtesy of AL Rhoton, Jr.)

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