Lymphatic capillaries
Lymphatic capillaries are larger than blood capillaries, typically 10 to 60 microns in diameter. They have irregular shapes and are composed of a single layer of endothelial cells without any additional tunics. In addition to their immune functions, lymph capillaries are also critical for maintaining fluid balance throughout the body. Specialized lymphatics in the small intestine, called lacteals, absorb dietary fats. 800x (upper left); 600x (lower left); 400x (right).
Lymph capillaries
Venules
Valves >
Larger lymph vessels possess valves, visible in this longitudinally section. Valves are formed by the endothelium and prevent the backflow of fluid within the vessel, like their counterparts in veins.
Direction of lymph flow >
The direction of lymph flow is indicated by the red arrow.
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