Vein - histology slide

The cross section of a small vein shows endothelial, medial, and adventitial layers. There is a single layer of endothelial cells, a smooth muscular media, and a prominent adventitia. The latter is made up of connective tissue and some smooth muscle cells and contains vasa vasorum.

Histology image descriptions and photography by Frank N. Miller, M.D.; histology image courtesy of Uniformed Services University of the Health Sciences.