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Venule

The composition of the walls of veins is the most variable of all vessels, and the three tunics are not always well demarcated.  The smallest venules, resembling large-diameter capillaries, are composed of endothelial cells and pericytes, which are multipotential cells with contractile properties.  As venules enlarge, they acquire smooth muscle in the tunica media.  400x

Venules <p>The composition of the walls of veins is the most variable of all vessels, and the three tunics are not always well demarcated.  The smallest venules, resembling large-diameter capillaries, are composed of endothelial cells and pericytes, which are multipotential cells with contractile properties.  As venules enlarge, they acquire smooth muscle in the tunica media.  400x</p>

Venules

The composition of the walls of veins is the most variable of all vessels, and the three tunics are not always well demarcated.  The smallest venules, resembling large-diameter capillaries, are composed of endothelial cells and pericytes, which are multipotential cells with contractile properties.  As venules enlarge, they acquire smooth muscle in the tunica media.  400x

 - Endothelium <p>The composition of the walls of veins is the most variable of all vessels, and the three tunics are not always well demarcated.  The smallest venules, resembling large-diameter capillaries, are composed of endothelial cells and pericytes, which are multipotential cells with contractile properties.  As venules enlarge, they acquire smooth muscle in the tunica media.  400x</p>

- Endothelium

The composition of the walls of veins is the most variable of all vessels, and the three tunics are not always well demarcated.  The smallest venules, resembling large-diameter capillaries, are composed of endothelial cells and pericytes, which are multipotential cells with contractile properties.  As venules enlarge, they acquire smooth muscle in the tunica media.  400x

Loose connective tissue <p>The composition of the walls of veins is the most variable of all vessels, and the three tunics are not always well demarcated.  The smallest venules, resembling large-diameter capillaries, are composed of endothelial cells and pericytes, which are multipotential cells with contractile properties.  As venules enlarge, they acquire smooth muscle in the tunica media.  400x</p>

Loose connective tissue

The composition of the walls of veins is the most variable of all vessels, and the three tunics are not always well demarcated.  The smallest venules, resembling large-diameter capillaries, are composed of endothelial cells and pericytes, which are multipotential cells with contractile properties.  As venules enlarge, they acquire smooth muscle in the tunica media.  400x