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Lymphatic trunks and ducts Thoracic duct Cisterna chyli Lymphoid system Main article: Lymphatic system Primary lymphoid organs Bone marrow Thymus Secondary lymphoid organs Spleen Pharyngeal lymphoid ring Lymph node Regional lymph nodes Lymph nodes of head and neck Lymph nodes of upper limb Thoracic lymph nodes Abdominal lymph nodes Pelvic lymph nodes Lymph nodes of lower limb |