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Bony Labyrinth Following Petrous Drilling

Surgical Correlation

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Right posterior and medial view of the bony labyrinth (with its superior, posterior, and lateral semicircular canal projections) and carotid canal following partial resection of petrous temporal bone. The facial nerve can be seen coursing within the facial canal. Its tympanic segment lies just beneath the lateral semicircular canal before entering the posterior wall (as its mastoid segment) of the tympanic cavity to exit the stylomastoid foramen. Within the petrous bone is the petrous segment of the internal carotid artery with its perivascular internal carotid nerve plexus. (Image courtesy of AL Rhoton, Jr.)

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