Fig. 9. Schematic drawing of superficial tributaries of external and internal jugular vein (left anterior oblique view of face). Superficial temporal vein draining into external jugular vein and facial vein draining into internal jugular vein anastomose with superior ophthalmic vein via angular vein surrounding anterior orbital opening. These venous networks can be alternative access routes into CS (curved arrows). CS: cavernous sinus.
