A deep vein is a vein that is deep in the body. This contrasts with superficial veins that are close to the body's surface.
Deep veins are almost always beside an artery with the same name (e.g. the femoral vein is beside the femoral artery). Collectively, they carry the vast majority of the blood. Occlusion of a deep vein can be life threatening and is most often caused by thrombosis. Occlusion of a deep vein by thrombosis is called deep vein thrombosis.
Deep veins are these blood vessels which are embedded far into the flesh, and if needing operation, it can be difficult.
Famous quotes containing the words deep and/or vein:
“With deep men, as with deep wells, it takes a long time for anything that falls into them to hit bottom. Onlookers, who almost never wait long enough, readily suppose that such men are callous and unresponsive—or even boring.”
—Friedrich Nietzsche (1844–1900)
“As polishing expresses the vein in marble, and grain in wood, so music brings out what of heroic lurks anywhere. The hero is the sole patron of music.”
—Henry David Thoreau (1817–1862)