Head and neck anatomy may be important in the development of the BBB. Astrocytes may also be responsible for transporting ions (electrolytes) from the brain to the blood. Blood from the brain and neck flows from: (1) within the cranium via the internal jugular veins, a continuation of the sigmoid sinuses. The right and left external jugular veins drain from the parotid glands, facial muscles, scalp into the subclavian veins. The right and left vertebral veins drain the vertebrae and muscles into the right subclavian vein and into the superior vena cava, into the right atrium of the heart. The lymphatic system drains 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