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As in the arteries, the walls of veins have three layers, or coats: an inner layer, or tunica intima; a middle layer, or tunica media; and an outer layer, or tunica adventitia. Each coat has a number of sublayers.
Veins tend often to look collapsed or flattened under the same circumstances. In addition, the tunica media of veins is much thinner than in arteries, and the adventitia is the thickest layer. Identify the three layers of both arteries and veins and note the differences in thickness. Slide #174 In very large vessels, the adventitial layer (outer layer) will contain blood vessels (vasa vasorum) that supply the vessel wall.