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 Off-the-Neck Historic District The Off-the-Neck Historic District encompasses a well-preserved set of early 19th-century rural properties on Maine State Route 166 (SR 166) in Castine, Maine, as well as canal dug in 1779 by British forces during the American Revolutionary War across the neck separating the Bagaduce Peninsula (where the main village of Castine is located) from the mainland. The district takes its name from the fact that the included properties are just north of this neck on the mainland. The district was listed on the National Register of Historic Places in 1986. Maine State Route 166 (SR 166) is