Fig. 3. Schematic drawing of anatomy of laterocavernous sinus (anterolateral view of coronal section). Laterocavernous sinus is a slit-like venous channel lying at the outer layer of lateral wall of CS. This channel plays a role of a drainage route of SMCV and UV. Laterocavernous sinus drains into the posterior part of CS, the superior petrosal sinus, the pterygoid plexus, and their combination (arrows). CS: cavernous sinus; SMCV: superficial middle cerebral vein; UV: uncal vein.