Large artery elastic a Structural characters I. tunica media consists of elastic membranes mainly abundant (40-70 layers)elastic laminas and a few smooth muscle cells in media 2. internal and external elastic membranes are not prominent 3. three layers are not distinguished◼ Structural characters 1. tunica media consists of elastic membranes mainly abundant (40~70 layers) elastic laminas and a few smooth muscle cells in media 2. internal and external elastic membranes are not prominent 3. three layers are not distinguished Large artery elastic A