Structure features of artery The wall of arteries consist of three layers or"coats' often referred to as tunics bundles elastie fibers ur nerve biood vess Tunica intimae-is the inner coat Tunica media-is the middle layer Tunica adventitia or tunica externa is the outer layer of the wall of the blood vesse Layers of arteries wall differ in MUSCULAR ARTERY different size blood vessels The structure and function of arteries change as their diameter decreases• The wall of Arteries consist of three layers or “coats” often referred to as tunics. – Tunica intimae – is the inner coat – Tunica media – is the middle layer – Tunica adventitia or tunica externa is the outer layer of the wall of the blood vessel • Layers of arteries wall differ in different size blood vessels. The structure and function of arteries change as their diameter decreases. Structure features of artery