Question #398

Considering the dural venous sinuses, which of the following statements is correct?

Inferior sagittal sinus drains directly into the left transverse sinus

The superior sagittal sinus drains predominantly into the right transverse sinus

The straight sinus grooves the occipital bone

The dural venous sinuses lie within the subarachnoid space

The inferior petrosal sinus drains into the cavernous sinus

Venous sinuses form at points where the two layers of the dura separate out.

The superior sagittal sinus is located in the superior edge of the falx cerebri. It extends from the crista galli backwards, grooving the cranial vault. It predominantly drains into the right transverse sinus, but also the left transverse sinus.

The inferior sagittal sinus lies in the inferior margin of the falx cerebri. It drains via the straight sinus into the left transverse sinus.

The straight sinus lies between the falx cerebri and tentorium cerebelli.

The transverse sinuses lie in the posterior and lateral edges of the tentorium cerebelli. They continue laterally as the sigmoid sinuses which groove the petrous part of the temporal bone before joining the inferior petrosal sinus to form the internal jugular vein at the jugular foramen.

The petrosal sinuses drain from the cavernous sinus – the inferior into the sigmoid sinus, the superior into the transverse sinus.

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