Medium artery and vein
These medium vessels demonstrate differences apparent in their walls. Lumens of veins are wider and their tunics are thinner and less organized than the arteries they accompany. Valves are present in veins but not in arteries. 100x
Medium vein
These medium vessels demonstrate differences apparent in their walls. Lumens of veins are wider and their tunics are thinner and less organized than the arteries they accompany. Valves are present in veins but not in arteries. 100x
Medium artery
These medium vessels demonstrate differences apparent in their walls. Lumens of veins are wider and their tunics are thinner and less organized than the arteries they accompany. Valves are present in veins but not in arteries. 100x
Tunica intima
These medium vessels demonstrate differences apparent in their walls. Lumens of veins are wider and their tunics are thinner and less organized than the arteries they accompany. Valves are present in veins but not in arteries. 100x
Tunica media
These medium vessels demonstrate differences apparent in their walls. Lumens of veins are wider and their tunics are thinner and less organized than the arteries they accompany. Valves are present in veins but not in arteries. 100x
Tunica adventitia
These medium vessels demonstrate differences apparent in their walls. Lumens of veins are wider and their tunics are thinner and less organized than the arteries they accompany. Valves are present in veins but not in arteries. 100x
Valves >
Valves are particularly prominent in veins of the lower extremity where they prevent the “back-flow” of blood due to gravity. Blood pressure on the venous side of the circulatory system is low and venous return to the heart is accomplished principally by adjacent skeletal muscle contraction, which produces a milking action in the vein.
Area shown in next image
Valves are particularly prominent in veins of the lower extremity where they prevent the “back-flow” of blood due to gravity. Blood pressure on the venous side of the circulatory system is low and venous return to the heart is accomplished principally by adjacent skeletal muscle contraction, which produces a milking action in the vein.
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