Figure 1215

Photomicrograph of the wall of a medium-sized vein. This photomicrograph shows the three tunics in a section through the wall of a medium-sized vein. The tunica intima consists of endothelium and a very thin subendothelial layer of connective tissue containing some smooth muscle cells. The tunica media contains circularly and spirally arranged smooth muscle cells with collagen and elastic fibers. Note the tunica adventitia, which contains an abundance of collagen and some elastic fibers. The few nuclei seen in this layer belong to fibroblasts. x360.

t. adventitia unmyelinated nerve elastic fibers fibroblasts blood vessel bundles of smooth muscle cells

collagen fibers bundles of smooth muscle cells

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