Your lymphatic system is a network of tissues and organs that help rid your body of toxins, waste, and other unwanted materials. The lymphatic system includes your lymph nodes, thymus, spleen, and tonsils. Your lymph nodes are small, bean-shaped glands that filter out harmful substances from your lymph fluid. The thymus is a small organ located in the upper chest that produces immune cells called T cells. The spleen is a large organ located in the upper abdomen that helps filter blood and remove old or damaged blood cells. The tonsils are small organs located in the back of the throat that trap bacteria and other particles inhaled or swallowed.