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White blood cells known as lymphocytes arise from by mitosis of stem cells in the bone marrow. Some lymphocytes migrate to the thymus and become T cells that circulate in the blood and are associated with the lymph nodes and spleen.
Therefore lymph, the fluid in lymph vessels, is basically a fluid of roughly the same composition as blood plasma. Lymph nodes are famous for their role in the Immune System. Structures called Lymph Nodes which produce cells called Lyphocytes. These have many and various function in the immune system.herefore lymph, the fluid in lymph vessels, is basically a fluid of roughly the same composition as blood plasma. Lymph nodes are famous for their role in the Immune System. Structures called Lymph Nodes which produce cells called Lyphocytes. These have many and various function in the immune system.