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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.
Besides the spleen and lymph nodes, the immune system includes lymphatic tissue depositions in the throat (adenoids) and the gut (Peyer's patches), the thymus, and the lymphatic vessels that drain the lymph and return it to the blood stream in the chest (into the azygous vein).