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FIG 5. Schematic anatomic diagram of the venous vasculature of the skull base (superior view). 1, superior ophthalmic vein; 2, anterior intercavernous sinus; 3, inferior ophthalmic vein; 4, pterygoid plexus; 5, middle meningeal vein; 6, superior petrosal sinus; 7, inferior petrosal sinus; 8, basilar venous plexus; 9, transverse sinus; 10, posterior intercavernous sinus; 11, cavernous sinus; 12, sphenoparietal sinus
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