What Are The 4 Lymphatic Organs?

What Are The 4 Lymphatic Organs? The lymphoid organs include the red bone marrow, thymus, spleen and clusters of lymph nodes. Blood and immune cells are produced inside the red bone marrow, during a process called haematopoiesis. The thymus secretes hormones that are essential for normal immune function and develops T-lymphocytes. What are the 3