Inferior petrosal sinus
The inferior petrosal sinuses are two small sinuses situated on the inferior border of the petrous part of the temporal bone, one on each side. Each inferior petrosal sinus drains the cavernous sinus into the internal jugular vein.
| Inferior petrosal sinus | |
|---|---|
 Dural veins | |
 The sinuses at the base of the skull. (Inferior petrosal sinus visible at center, between superior petrosal sinus and basilar plexus.) | |
| Details | |
| Source | cavernous sinus |
| Drains to | internal jugular vein |
| Identifiers | |
| Latin | sinus petrosus inferior |
| TA98 | A12.3.05.113 |
| TA2 | 4858 |
| FMA | 50770 |
| Anatomical terminology | |
Structure
The inferior petrosal sinus is situated in the inferior petrosal sulcus, formed by the junction of the petrous part of the temporal bone with the basilar part of the occipital bone. It begins below and behind the cavernous sinus and, passing through the anterior part of the jugular foramen, ends in the superior bulb of the internal jugular vein.
Function
The inferior petrosal sinus receives the internal auditory veins and also veins from the medulla oblongata, pons, and under surface of the cerebellum.
Additional images
Sagittal section of the skull, showing the sinuses of the dura.
References
This article incorporates text in the public domain from page 659 of the 20th edition of Gray's Anatomy (1918)
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