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
The Awkward Yeti of "The Awkward Yeti". "Heart and Brain" features Lars' anthropomorphized heart and brain as the two main characters. In the webcomic, the heart follows its feelings and emotions, chasing down butterflies and getting excited about kittens, while the brain is concerned about adult responsibility. While the heart skips to emotional need, the brain brings in reason and logic for why the heart's action are ill-advised. Lindsey Holmes described "Heart and Brain" as "the internal tennis match we often face between our romantic hearts and our realistic brains." The characters of "Heart and Brain" are considered very relatable, as they cover