Block3/Fig.12a Photomicrograph of muscular artery.

block4_24.jpg - Fig.12a Photomicrograph of muscular artery. The arteryhas a thicker tunica media, a narrower lumen than thesimilarly sized vein, and thickened elastic laminae not presentin the vein. The characteristics are described in figure 10.Fig.12b Photomicrograph of medium-sized vein.The vein, by contrast, has a thicker tunica adventitia, a widerlumen, and valves. The tunica intima consists of endotheliumand a very thin subendothelial layer of connective tissue. Thevalve consists of projections of the tunica intima of the veinwall; the projections are lined on both sides by endothelium.The tunica media contains circularly and spirally arrangedsmooth muscle cells. The tunica adventitia contains anabundance of collagen (pink) and elastic fibers (black).

Fig.12a Photomicrograph of muscular artery. The artery has a thicker tunica media, a narrower lumen than the similarly sized vein, and thickened elastic laminae not present in the vein. The characteristics are described in figure 10.

Fig.12b Photomicrograph of medium-sized vein. The vein, by contrast, has a thicker tunica adventitia, a wider lumen, and valves. The tunica intima consists of endothelium and a very thin subendothelial layer of connective tissue. The valve consists of projections of the tunica intima of the vein wall; the projections are lined on both sides by endothelium. The tunica media contains circularly and spirally arranged smooth muscle cells. The tunica adventitia contains an abundance of collagen (pink) and elastic fibers (black).

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