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Figure 14: Drilling beneath and lateral to GSPN exposes the internal carotid artery in the horizontal portion of petrous canal, which is confirmed by doppler. The tegmen tympani is a thin plate of bone roofing the tympanic cavity lateral to arcuate eminence

Figure 14: Drilling beneath and lateral to GSPN exposes the internal carotid artery in the horizontal portion of petrous canal, which is confirmed by doppler. The tegmen tympani is a thin plate of bone roofing the tympanic cavity lateral to arcuate eminence