The<unk>  <unk> , part of the immune system, consists of the phagocytic cells located in reticular connective tissue, primarily monocytes and macrophages. These cells accumulate in lymph nodes and the spleen. The Kupffer cells of the liver and tissue histiocytes are also part of the<unk> .
Mononuclear phagocytic system and lymphoreticular system are synonymous with<unk> .
The<unk>  is divided into primary and secondary lymphoid organs.
Reticuloendothelial system
Lymph vascular system
Lymphatic system
Hepatic circulation
Enteric nervous system
Circulatory system
Autonomic nervous system
Sympathetic nervous system