Vessel
Cavernous sinus
A parasellar venous network surrounding critical neurovascular structures
High-yield
The standard lateral-wall sequence is III, IV, V1 and V2 from superior to inferior; VI accompanies the ICA more medially. Fine descriptions of V2 relative to the wall vary with the anatomical boundary used.
Overview
The cavernous venous spaces lie beside the sella, between the orbital-fissure region and petrous apex. Trabeculae divide their channels. The cavernous ICA, its sympathetic fibers and CN VI pass within the venous compartment; III, IV and trigeminal divisions follow the lateral-wall region. Venous connections link the orbit, face, cranial cavity and skull base.
Reference facts
- Origin
- Receives orbital venous blood, especially through superior ophthalmic and variable inferior ophthalmic connections, together with intracranial and skull-base tributaries.
- Course
- Extends alongside the sphenoid body and pituitary region. Intercavernous channels connect the two sides around the sellar region.
- Branches
- Tributaries include ophthalmic, hypophyseal and meningeal veins and variable superficial middle cerebral/sphenoparietal connections; these are venous inputs rather than arterial-style branches.
- Drains to
- Petrosal routes lead toward the transverse–sigmoid system and jugular bulb. Additional communications reach the pterygoid and basilar venous plexuses.
Mnemonic
Wall: III–IV–V1–V2. Medial venous compartment: carotid artery and VI, with accompanying sympathetic fibers.
Clinical correlation
Infection can spread through facial-orbital venous connections to cause cavernous sinus thrombosis. Painful restricted eye movements, orbital swelling, proptosis and chemosis may result; VI is vulnerable but need not be the first deficit. Facial and superior ophthalmic veins can contain valves, so universal valvelessness is not the explanation.
Frequently asked questions
Where does the cavernous sinus originate?
Receives orbital venous blood, especially through superior ophthalmic and variable inferior ophthalmic connections, together with intracranial and skull-base tributaries.
Where does the cavernous sinus drain to?
Petrosal routes lead toward the transverse–sigmoid system and jugular bulb. Additional communications reach the pterygoid and basilar venous plexuses.
What are the tributaries of the cavernous sinus?
Tributaries include ophthalmic, hypophyseal and meningeal veins and variable superficial middle cerebral/sphenoparietal connections; these are venous inputs rather than arterial-style branches.
What is the course of the cavernous sinus?
Extends alongside the sphenoid body and pituitary region. Intercavernous channels connect the two sides around the sellar region.