The sphenoparietal sinus is a small venous channel located within the skull, which plays a role in regulating drainage of blood from the brain. While the term sphenoparietal sinus is specific and clearly describes this structure, there are a few alternative names that can be used to refer to this region of the skull. These synonyms include the lateral venous lacuna, the cavernous sinus, and the petroclival vein. Each of these names describes a slightly different area of the skull, but they are all related to the venous structures that drain blood from the brain and face.