Emissary veins passing through the foramen ovale, jugular foramen, foramen lacerum, and hypoglossal canal. Because the emissary veins are valveless, they are an important part in selective brain cooling through bidirectional flow of cooler blood from the evaporating surface of the head. In general, blood flow is from external to internal but the flow can be altered by increased intracranial pressure. A type of emissary vein goes through the sphenoidal emissary foramen inferior to the zygomatic arch with the cavernous sinus on the inside of the skull. This is an important route for spread of infection because cranial nerve VI and the
Head and Neck Cancer Alliance and other related functions. The Head and Neck Cancer Alliance has also developed a free app on iTunes to assist people with screening themselves for head and neck cancer; the app is available at https://itunes.apple.com/us/app/head-and-neck-check/id784226942?mt=8. It was found that awareness about oral cancer among patients in Jordan is low. These patients, especially those in high-risk groups for mouth cancer and those of lower socio-economic status, are less well informed about the signs and risk factors of oral cancer. Interventions to improve public knowledge about oral cancer and attitudes towards early diagnosis and treatment are urgently indicated. Head and Neck Cancer