RM
Large vein wall, light micrograph
Light micrograph of a longitudinal section of a large vein showing, from the top, the tunica intima with the endothelium and a thin subendothelial connective tissue. Then a middle layer formed by a few bundles of circular cross-sectioned myocytes. The majority of the wall is occupied by intermingled bundles of collagen fibres belonging to the tunica adventitia. A small blood vessel (belonging to the vasa vasorum system) can be seen in the adventitia., by JOSE CALVO / SCIENCE PHOTO LIBRARY
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