The smooth muscle of the artery.
D000328:Adult; D000818:Animals; D001011:Aorta / Q000503:physiopathology; D001158:Arteries / Q000502:physiology* / Q000648:ultrastructure; D001161:Arteriosclerosis / Q000503:physiopathology; D004727:Endothelium / Q000648:ultrastructure; D006168:Guinea Pigs; D006801:Humans; D050356:Lipid Metabolism; D008875:Middle Aged; D009119:Muscle Contraction; D009130:Muscle, Smooth / Q000502:physiology* / Q000648:ultrastructure; D011817:Rabbits; D051381:Rats