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Bone marrow, lymph nodes, spleen, tonsils, thymus and Peyer's patches in the small intestine, the liver, and the appendix are all parts of the lymphatic system.
The bone marrow and thymus represent training grounds for two cells of the immune system (B-cells and T-cells, respectively). The development of all cells of the immune system begins in the bone marrow with a hematopoietic (blood-forming) stem cell (Figure 2).ature T-cells leave the thymus and populate other organs of the immune system, such as the spleen, lymph nodes, bone marrow and blood. Each T-cell reacts with a specific antigen, just as each antibody molecule reacts with a specific antigen.