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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 are swollen and enlarged veins â usually blue or dark purple â that usually occur on the legs.They may also be lumpy, bulging or twisted in appearance. Other symptoms include: 1  aching, heavy and uncomfortable legs. 2  swollen feet and ankles. 3  muscle cramp in your legs.aricose veins are swollen and enlarged veins â usually blue or dark purple â that usually occur on the legs.