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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 and venous insufficiency. Varicose veins are swollen, twisted, and enlarged veins that you can see under the skin. They are often red or blue in color. They usually appear in the legs, but can occur in other parts of the body. Normally, one-way valves in your leg veins keep blood moving up toward the heart. When the valves do not work properly, they allow blood to back up into the vein. The vein swells from the blood that collects there, which causes varicose veins.