Cerebral venous sinuses are large channels located within the brain that collect deoxygenated blood from the cerebral veins. They play a crucial role in draining blood away from the brain and returning it to the heart. These sinuses are situated between the layers of the dura mater, which is the outermost protective layer of the brain. The main cerebral venous sinuses include the superior sagittal sinus, transverse sinuses, and internal jugular veins. They are responsible for regulating intracranial pressure and ensuring proper blood flow. Any blockage or thrombosis in these sinuses can lead to serious conditions, such as cerebral venous sinus thrombosis.