Air embolism and veins is greater than atmospheric pressure, an air embolus does not often happen when a blood vessel is injured. In the veins above the heart, such as in the head and neck, the venous pressure may be less than atmospheric and an injury may let air in. This is one reason why surgeons must be particularly careful when operating on the brain, and why the head of the bed is tilted down when inserting or removing a central venous catheter from the jugular or subclavian veins. When air enters the veins, it travels to the right side of the
Head and Neck Cancer Alliance head and neck cancer In addition to year-round events and awareness efforts such as benefit concerts and walkathons, the Alliance sponsors a week-long series of events to promote early detection and public awareness of this disease. Oral, Head and Neck Cancer Awareness Week (OHANCAW), Cancers of the mouth (lip and tongue), larynx (voice box), pharynx (throat), salivary glands, and nose/nasal passages are generally known as head and neck cancer. These cancers typically form in the squamous cells, which are the cells lining the moistened, mucosal locations of the head and neck, such as the nose, mouth and throat. Such squamous