The diploic vein is a small blood vessel that runs through the spongy bone in the skull. It is also known as the diploe vein or diploic venous system. Alternative terms for the diploic vein include the venae diploicae, diploic vessels, and intraosseous veins. The diploic vein is important for draining blood from the brain and surrounding tissues, and for regulating the pressure within the skull. If the diploic vein becomes blocked or damaged, it can lead to serious health problems. Therefore, it is important to know the various synonyms for the diploic vein to help in better communication in medical settings.