Cavernous sinus communicates with

Draining channels or communications the cavernous sinus drains: 1.into the transverse sinus through the superior petrosal sinus. 2.into the internal jugular vein through the inferior petrosal sinus and through a plexus around the internal carotid aery. 3. into the pterygoid plexus of veins through the emissary veins passing through the foramen ovals, the foramen lacerum, and the emissary sphenoidal foramen 4. In to the facial vein through the superior ophthalmic vein. 5.the right and left cavernous sinuses communicate with each other through the anterior and posterior intercavernous sinuses and through the basilar plexus of veins. Notes: all these communications are valveless and blood can flow through them in either direction Ref: BDC volume3;Sixth edition pg 195