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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.
Spleen. The spleen is an organ in the upper left abdomen, which filters blood, disposes of worn-out red blood cells, and provides a 'reserve supply' of blood. It contains both red tissue, and white lymphatic tissue. Different parts of the the spleen specialize in different kinds of immune cells. Lymphocytes initially develop in the bone marrow. 2  Some migrate to the thymus, where they mature into T cells; others mature in the bone marrow as B cells. 3  Neutrophils: are the most abundant type of white blood cells and are an important part of the innate immune system.