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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.
Among the organs that contribute to our immune response, there are two categories: primary lymphoid organs and secondary lymphoid organs. The bone marrow is one of two primary lymphoid organs, along with the thymus. Bone marrow is a sponge-like tissue found at the center of the body's large, flat bones.he bone marrow is one of two primary lymphoid organs, along with the thymus. Bone marrow is a sponge-like tissue found at the center of the body's large, flat bones.