Fig. 3

Artery structure and pathology. Movat-stained sections of human blood vessels are shown, with elastic fibers in black, collagen in yellow, proteoglycans in blue, and smooth muscle cells in red. Red arrows indicate the internal elastic lamina, and white arrows indicate the external elastic lamina. A, Elastic artery (aorta ×40 magnification, inset is ×100 magnification). Note the elastic fibers separating each layer of smooth muscle cells. B, Muscular artery (vasa vasorum ×200 magnification). Note the lack of elastic fibers. C, Intimal hyperplasia and formation of neointima (left, coronary artery ×200 magnification; right, vasa vasroum ×200 magnification). Note the proliferation of red-stained smooth muscle cells on the intimal side of the internal elastic lamina.