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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 <p>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</p>

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 <p>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</p>

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 <p>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</p>

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 <p>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</p>

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