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
Tales from the Heart with nine later issues published by Slave Labor Graphics (from 1988 to 1994). Slave Labor published "Tales from the Heart: Hearts of Africa" in 1994, which collected issues #1-3 and featured an introduction by Neil Gaiman. Two color graphic novels, "Tales from the Heart of Africa: The Temporary Natives" (1990) and "A Tale From the Heart of Africa: Bloodlines" (1992) were published by the Marvel Comics imprint Epic Comics. "A Tale From the Heart of Africa: Bloodlines" (Epic, 1992) was nominated for two Eisner Awards in 1993, for Best Single Issue, Self-Contained Story; and Best Graphic Album — New. Tales