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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.
Natural Health Care. Varicose veins are enlarged and often swollen veins that can become visible under the skin of your legs. Prevention of varicose veins best begins with understanding how your veins work. Your veins are vessels that carry blood from all of the cells of your body to your heart.atural Health Care. Varicose veins are enlarged and often swollen veins that can become visible under the skin of your legs. Prevention of varicose veins best begins with understanding how your veins work. Your veins are vessels that carry blood from all of the cells of your body to your heart.