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Inferior Petrosal Sinus
Cardiovascular System

Inferior Petrosal Sinus

Sinus petrosus inferior

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Quick Facts

Origin: Cavernous sinus.

Course: Extends along the inferior border of the petrous bone.

Tributaries: Vein of cochlear aqueduct, tributaries from the medulla oblongata, pons, and inferior cerebellar surfaces.

Drainage: Medulla oblongata, pons and inferior cerebellum, internal ear.

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Origin

The inferior petrosal sinuses are small sinuses which originate from the posteroinferior aspects of the cavernous sinuses, on each side of the sella turcica.

Course

Each inferior petrosal sinus descends from the cavernous sinus through a shallow groove between the basilar part of the occipital bone and the petrous part of the temporal, before it eventually drains into the internal jugular vein.

Tributaries

The inferior petrosal sinus receives several tributaries prior to merging with the sigmoid sinus to form the internal jugular vein. For instance, it receives labyrinthine veins and tributaries from the medulla oblongata, pons, and inferior cerebellar surfaces.

Structures Drained

The inferior petrosal sinus drains venous blood from the medulla oblongata, pons and inferior cerebellum, and internal ear.

Learn more about this topic from other Elsevier products

Inferior Petrosal Sinus

ScienceDirect image

The inferior petrosal sinuses (IPS) lie on the petro-occipital fissure and drain the CS into the jugular bulb via the clival venous plexus [3].

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