This document discusses the dural venous sinuses and cavernous sinus. It describes the dural venous sinuses as venous channels in the cranial dura that drain blood from the brain, meninges, and skull bones. The cavernous sinus is a paired dural venous sinus located on either side of the sphenoid bone. It contains the internal carotid artery and cranial nerves III, IV, V1, and V2. The document outlines the anatomy and tributaries of the cavernous sinus in detail. Clinical implications including cavernous sinus thrombosis and pulsatile exophthalmos due to carotid artery rupture are also mentioned.