Basilar venous plexus

Network of veins in the brain

The basilar venous plexus is a complex network of veins located at the base of the brain, specifically within the posterior cranial fossa. This venous structure plays a crucial role in the drainage of blood from the brainstem and surrounding areas, connecting various venous channels and facilitating the return of deoxygenated blood to the systemic circulation.

Anatomy

The basilar venous plexus is situated around the clivus, a sloping bony surface at the base of the skull. It is closely associated with the dura mater, the tough outermost membrane enveloping the brain and spinal cord. The plexus is part of the cerebral venous system and is connected to several important venous structures, including the cavernous sinus, the superior petrosal sinus, and the inferior petrosal sinus.

Basilar venous plexus and surrounding structures

Function

The primary function of the basilar venous plexus is to facilitate the drainage of venous blood from the brainstem and adjacent regions. It acts as a conduit for blood flow between the cerebral veins and the larger venous sinuses. This plexus is particularly important in maintaining intracranial pressure and ensuring efficient venous return from the brain.

Clinical Significance

The basilar venous plexus can be involved in various pathological conditions. For instance, thrombosis or blockage of this plexus can lead to increased intracranial pressure and associated symptoms such as headache, nausea, and neurological deficits. Additionally, the plexus may be involved in the spread of infections or tumors within the cranial cavity due to its extensive connections with other venous structures.

Related Structures

The basilar venous plexus is part of a larger network of venous channels that include:

• Cavernous sinus
• Superior petrosal sinus
• Inferior petrosal sinus
• Transverse sinus
• Sigmoid sinus

Related Pages

• Cerebral venous sinus thrombosis
• Intracranial pressure
• Dural venous sinuses