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
Martian (The War of the Worlds) Martian (The War of the Worlds) Little about the Martians is definitive, the story being told by a first-person narrator. The Martians are described as octopus-like creatures: the "body" consisting of a disembodied head nearly across, having two eyes; a v-shaped, beak-like mouth; and two branches each of eight 'almost whip-like' tentacles, grouped around the mouth, referred to as the 'hands'. They reproduce asexually, by "budding" off from a parent. Internally, the Martians consist of a brain, lungs, heart, and blood vessels; they have no organs for digestion, and therefore sustain themselves on Earth by mechanically transfusing blood via pipettes