Artery and vein, light micrograph
Light micrograph of a muscular artery (right), vein (left) and a nerve bundle (centre) surrounded by adipose (fat) tissue. The artery has having a thicker tunica media (middle layer). The vein has a thicker tunica adventitia (outer layer). Haematoxylin and eosin stain. The scale bar corresponds to 2 mm., by JOSE CALVO / SCIENCE PHOTO LIBRARY
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