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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 components of the lymphatic system are divided into two groups â the primary organs and the secondary organs. 1  Primary Organs: The thymus gland and the bone marrow are primary organs. They regulate the production and differentiation of lymphocytes â the cells that make up the immune system. Secondary Organs: The secondary organs include the lymphatic vessels, lymph nodes, aggregated lymphoid tissue, and spleen. These secondary organs are involved, to some extent, in all three lymphatic functions.