The inferior sagittal sinus is located in the lower free border of the falx cerebri between the two cerebral hemispheres. It begins anteriorly and ends with its junction with straight sinus. The straight sinus originates with the union of the great cerebral vein and inferior sagittal sinus. The cavernous sinuses are found on either side of the body of the sphenoid bone in middle cranial fossae. They receive blood from the sphenoparietal sinuses which are located underneath the free edges of the lesser wings of the sphenoid bone.
Blood also drains into the cavernous sinuses via the superior and inferior ophthalmic veins.
The intercavernous sinuses provide a communication between the cavernous sinuses. They are located in the diaphragma sellae which covers the hypophyseal fossa and surrounds the hypophyseal stalk. The internal carotid artery, sympathetic nerve plexus and the abducens nerve are inside the cavernous sinuses. In the wall of the cavernous sinuses are the oculomotor, trochlear, ophthalmic and maxillary nerves. The cavernous sinuses drain posteriorly through the superior and inferior petrosal sinuses and inferiorly through the pterygoid plexus of veins.