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throughout the body) and other lymphoid tissues (such as the spleen, bone marrow, and. some other organs, including the skin). Lymphomas can start in any of these places. When a non-Hodgkin lymphoma starts only in the skin (not in other organs or tissues) it. is called a skin lymphoma (or cutaneous lymphoma). A lymphoma that starts in lymph. nodes or another part of the body and then spreads to the skin is not a skin lymphoma. (because it didnât start there).
1 Thymus. 2  The thymus gland is the main organ of the lymphatic system. 3  Its primary function is to promote the development of specific cells of the immune system called T-lymphocytes. 4  Once mature, these cells leave the thymus and are transported via blood vessels to the lymph nodes and spleen. The spleen is the largest organ of the lymphatic system. 2  Its primary function is to filter blood of damaged cells, cellular debris, and pathogens. 3  Like the thymus, the spleen houses and aids in the maturation of lymphocytes. 4  Lymphocytes destroy pathogens and dead cells in the blood.