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Tunica intima
Inner layer, consists of endothelial cell lining with connective tissue beneath
Tunica media
Middle layer, thickest component, composed of smooth muscle with elastic fibers and collagen
Tunica adventitia
Outer layer, composed of connective tissue, nerve fibers, and small vessel capillaries, contacts surrounding tissue
Arterioles
Small arteries 4 mm wide, 'stopcocks' of vascular system, circular smooth muscle layers control contraction and resistance