Medium vein
Smooth muscle forms a more definitive and continuous tunica media in medium veins compared with small veins. Most named veins are medium veins. The valve in this vessel is formed by an extension of the tunica intima. Valves serve to prevent back-flow of blood and are most prevalent in the lower extremities. 200x
Endothelium
Smooth muscle forms a more definitive and continuous tunica media in medium veins compared with small veins. Most named veins are medium veins. The valve in this vessel is formed by an extension of the tunica intima. Valves serve to prevent back-flow of blood and are most prevalent in the lower extremities. 200x
Tunica media
Smooth muscle forms a more definitive and continuous tunica media in medium veins compared with small veins. Most named veins are medium veins. The valve in this vessel is formed by an extension of the tunica intima. Valves serve to prevent back-flow of blood and are most prevalent in the lower extremities. 200x
Tunica adventitia
Smooth muscle forms a more definitive and continuous tunica media in medium veins compared with small veins. Most named veins are medium veins. The valve in this vessel is formed by an extension of the tunica intima. Valves serve to prevent back-flow of blood and are most prevalent in the lower extremities. 200x
Valve flaps
Smooth muscle forms a more definitive and continuous tunica media in medium veins compared with small veins. Most named veins are medium veins. The valve in this vessel is formed by an extension of the tunica intima. Valves serve to prevent back-flow of blood and are most prevalent in the lower extremities. 200x
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