lymphatic capillary plexus, one of the numerous networks of lymphatic capillaries that collect lymph from the intercellular fluid and constitute the beginning of the lymphatic system. The lymphatic vessels arise from the capillary plexuses, which vary in size and number in different regions and organs of the body. The capillary networks do not contain lymphatic valves as do the vessels. The plexuses are especially abundant in the dermis of the skin but also lace many other areas, such as the mucous membranes of the respiratory and digestive systems, testes, ovaries, liver, kidneys, and heart. See also lymphatic system.
