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
Off-the-Neck Historic District the principal state road leading northward from the village of Castine, which is located at the end of a large peninsula defined by Penobscot Bay on the west and the Bagaduce River on the east. The village proper is located on the Bagaduce Peninsula, which is separated from the larger peninsula by a neck of land between Wadsworth Cove and Hatch Cove. From this neck, SR 166 runs roughly north-by-northeast, paralleling the Bagaduce River up to a junction with Maine State Route 199. SR 166A runs follows a more northerly course, beginning just north of the neck and paralleling the