2) Large A elastIcA Structural features a. tunica intima is thick. and internal elastic M is not prominant b. Tunica media: consists of 40-70 layers of elastic membrane ce and sm2) Large A: elastic A ---Structural features: a. Tunica intima is thick, and internal elastic M is not prominant b. Tunica media: consists of 40-70 layers of elastic membrane, CF and SM