It receives blood from the
- inferior ophthalmic vein (or a branch thereof)
- superficial middle cerebral vein
- inferior cerebral veins
- sphenoparietal sinus
- and occasionally
Drainage of the cavernous sinus is via:
- superior petrosal sinus to the transverse sinus
- inferior petrosal sinus directly to the jugular bulb
- venous plexus on the internal carotid artery to the pterygoid plexus
- emissary viens passing through the:
Depending on relative pressures the superior ophthalmic veins either drain to or drain the cavernous sinus.
Additionally the cavernous sinuses connect to each other via the intercavernous sinuses.
- In the lateral wall from superior to inferior:
- Traversing the sinus lateral to the ICA
These can be remembered with the mnemonic OTOM CAT.
The internal carotid artery enters the posterior inferior aspect of the sinus, and bends upon itself as the carotid siphon (cavernous segment - C4). Two branches arise from this segment: meningohypophyseal trunk and inferolateral trunk.