Caption

Artery anatomy. Artwork showing the detailed structure of the layers making up the wall of an artery. Working outwards (right to left) from the internal layers, the first three of the six layers shown here constitute the tunica intima. These three layers are the endothelium (pink), basal lamina (orange) and internal elastic tissue (yellow). The outer three layers are the tunica media (pink, muscular), another elastic layer (external elastic layer, yellow), and the outermost tunica adventitia layer.