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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.
Treating a blown vein. 1  Identify whether or not the vein is blown. 2  Apply pressure to the area. 3  Clean the open skin with the proper antibacterial materials.  Apply ice pack to minimize swelling, inflammation and 1  bruising. Consult a professional if there is any concern for infection, toxicity or additional damage.