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Middle fossa floor and cavernous sinus. 1, sphenoidal sinus; 2, gasserian ganglion; 3, middle meningeal artery; 4, internal carotid artery (intrapetrous portion); 5, Eustachian tube. Lat. M., lateralis muscle; MCA, middle cerebral artery; *supratrochlear triangle; **infratrochlear triangle.
