Resulting reduction in intracapillary colloid at the venous end of the blood capillary lessens the osmotic attraction for tissue fluid to come back into the capillary. Obstruction of lymphatic vessels receiving the lymph drained from tissue fluid by lymph capillaries, for instance, blockage by metastatic cancer cells. 2 Larger vessels and systems start independently of one another. Their tunics with muscle and CT are added from mesenchymal condensations around the endothelium. 4 Capillaries of the adult can multiply or regenerate by extending cords of endothelial cells, which arrange themselves into a tubule.
Cords can fuse with one another to build an anastomosing network.