In immunology, the<unk>  or<unk> <unk> c system <unk>  also known as the reticuloendothelial system or macrophage system is a part of the immune system that consists of the<unk> c cells located in reticular connective tissue. The cells are primarily monocytes and macrophages, and they accumulate in lymph nodes and the spleen. The Kupffer cells of the liver and tissue histiocytes are also part of the<unk> . The<unk>  and the monocyte macrophage system refer to two different entities, often mistakenly understood as one. "Reticuloendothelial system" is an older term for the<unk> , but it is used less commonly now, as it is understood that most endothelial cells are not macrophages. The<unk>  is also a somewhat dated concept trying to combine a broad range of cells, and should be used with caution.
Mononuclear phagocyte system
Adaptive immune system
Immune system
Respiratory burst
Reticuloendothelial system
Ocular immune system
Lymphopoiesis
Endocrine system