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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.
Varicose veins. Varicose veins are veins near the surface of the skin, usually in the legs, that have become swollen and can be felt through the skin.These bulging, bluish veins are often found on the inside of the calf or thigh. An estimated 20 to 25 million people in the United States have varicose veins.aricose veins. Varicose veins are veins near the surface of the skin, usually in the legs, that have become swollen and can be felt through the skin.