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Anatomy of the spleen in relation to the other abdominal organs. Shows a large cut away view of a spleen with the splenic vein, splenic artery and hilum. At the bottom of the graphic is a caption reading: The spleen is the largest organ in the lymphatic system. The lymphatic system is composed of the spleen, lymph nodes, lymph vessels and the thymus gland. This system helps the body fight infections.