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Basilar Venous Plexus

plexus basilaris

The basilar venous plexus is a network of interconnected venous channels between the layers of dura on the clivus, the sloping bone behind the sella. It links the two inferior petrosal sinuses and the cavernous sinuses. Below, it connects through the foramen magnum with the internal vertebral venous plexus.

Anatomical Data

Course & Branches

Origin	Venous channels in the dura over the clivus
Course	Extends from the dorsum sellae down the clivus to the foramen magnum, linking the cavernous and inferior petrosal sinuses with the internal vertebral venous plexus
Branches	Communications with the inferior petrosal sinuses Communications with the cavernous sinuses Communication with the internal vertebral venous plexus

Clinical Relevance

Clinical Notes

The basilar plexus is a major source of bleeding in endoscopic endonasal and transclival surgery for chordomas, chondrosarcomas and other skull base tumours. Its valveless connection with the vertebral venous plexus forms a route for spread of tumour and infection between the pelvis, spine and skull base. It is also a pathway by which pressure and flow changes are shared between the cavernous and petrosal sinuses.

Pathology

Common Injuries & Conditions

Bleeding in Transclival Surgery

Drilling of the clivus and opening of the dura cross the basilar plexus, producing heavy venous bleeding that is controlled with haemostatic agents and careful patient positioning.

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