ASTRID & HANNS-FRIEDER MICHLER / SCIENCE PHOTO LIBRARY ASTRID & HANNS-FRIEDER MICHLER / SCIENCE PHOTO LIBRARY
Light micrograph of a longitudinal section of a large vein (lumen white). The thin inner layer of the wall (dark red), known as tunica intima, is formed by a flattened epithelium supported by a layer of connective tissue containing a few elastic fibres. The tunica intima is surrounded by the tunica media which consists of several layers of smooth muscle separated by layers of collagenous connective tissue. The last layer, the tunica adventitia is best seen at top right. In large veins the tunica adventitia is thicker than the tunica media and contains many longitudinal muscle fibres. Magnification: x25 at 35mm size.
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