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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.
Leg Vein Problems. Varicose veins are abnormally stretched or swollen veins that protrude from the surface of the skin. Generally found on the legs, varicose veins are the result of faulty vein valves or weak vein walls. Spider veins, or broken capillaries, are medically referred to as telangiectasia. They are dilated capillary veins less than 2mm in diameter that exist just below the surface of the skin on the legs or face.