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Lymph vessel
Larger lymph vessels, as here, have irregularly arranged walls consisting of an endothelium overlying scattered smooth muscle cells and an adventitia of connective tissue. Valves are present in larger lymph vessels to prevent the backflow of lymph. 400x

Endothelium
Larger lymph vessels, as here, have irregularly arranged walls consisting of an endothelium overlying scattered smooth muscle cells and an adventitia of connective tissue. Valves are present in larger lymph vessels to prevent the backflow of lymph. 400x

Smooth muscle
Larger lymph vessels, as here, have irregularly arranged walls consisting of an endothelium overlying scattered smooth muscle cells and an adventitia of connective tissue. Valves are present in larger lymph vessels to prevent the backflow of lymph. 400x

Adventitia
Larger lymph vessels, as here, have irregularly arranged walls consisting of an endothelium overlying scattered smooth muscle cells and an adventitia of connective tissue. Valves are present in larger lymph vessels to prevent the backflow of lymph. 400x

Valve flaps >
Lymph vessels possess valves, composed of paired flaps, to prohibit backflow of lymph. Portions of the paired flaps are seen in this section; the missing portions of the flaps are indicated by the red lines.

Lymph
Lymph vessels possess valves, composed of paired flaps, to prohibit backflow of lymph. Portions of the paired flaps are seen in this section; the missing portions of the flaps are indicated by the red lines.

Area shown in next image
This region is shown at higher magnification in the next image.