petrosal sinuses

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petrosal sinuses,

channels, superior and inferior, that drain the cavernous sinuses into the transverse sinuses. The superior petrosal sinuses receive cerebral and cerebellar veins, whereas the inferior petrosal sinuses receive cerebellar veins and veins from the internal ear and brainstem. Basilar sinuses connect the inferior petrosal sinuses to each other and to the vertebral plexus of veins.

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