Inferior petrosal sinus
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The inferior petrosal sinuses are small sinuses situated on the inferior border of the petrous part of the temporal bone on each side.
Each inferior petrosal sinus drains the cavernous sinus into the internal jugular vein.
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.