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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.
Note: you may find bone marrow, thymus gland, spleen and lymph nodes in the same group (primary organs)- it depends on the author, the book and the importance of the role an specific organ plays in the immune system in that given context.alking about the immune organs (i'll get back to the immune system cells later): Primary Organs: Thymus-located beneath the breast bone. Those two lobes! It functions at its peak during adolescence producing specialized lymphocytes-T-cells and B-cells and dispatching them through lymph vessels to secondary organs.