Layers of a large vein wall, light micrograph
Light micrograph of a large vein wall showing, from the top, the tunica intima with the endothelium and a thin subendothelial connective tissue. The middle muscular layer is absent (a frequent feature in larger veins). The majority of the wall is occupied by intermingled bundles of collagen fibres belonging to the tunica adventitia., by JOSE CALVO / SCIENCE PHOTO LIBRARY
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