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Reticuloendothelial system: Wikis


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The reticuloendothelial system (RES) is a part of the immune system that consists of the phagocytic 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 RES. A lymphoma of the reticuloendothelial system is called reticuloendotheliosis[needs citation].

Mononuclear phagocytic system and lymphoreticular system are synonymous with RES.

The reticuloendothelial system is divided into primary and secondary lymphoid organs.


Primary lymphoid organs

Primary (or "central") lymphoid organs are the sites where the cells of the RES are produced. Such sites include the bone marrow, and also the thymus as it is the required site for T cell maturation.

Secondary lymphoid organs

Secondary (or "peripheral") lymphoid organs are the sites where the cells of the RES function. This includes the lymph nodes, tonsils, spleen, and "MALT" (mucosa-associated lymphoid tissue).

  • The Kupffer cells of the liver act as part of this system but are not organized into a tissue; rather, they are dispersed throughout the liver sinusoids.
  • The microglia of the central nervous system (CNS) can be considered a part of the reticuloendoethelial system. They are scavenger cells that proliferate in response to CNS injury.


The secondary lymphoid structures function to survey all entering or circulating antigens and to mobilize an immune response against foreign antigen upon its discovery. The GALT and BALT are exposed to antigens entering the gastrointestinal and respiratory tracts, respectively. All extracellular fluid must filter through lymph nodes as it traverses the lymphatics on its way back to the systemic circulation. Antigen residing in the interstitium is thus swept to the lymph nodes for processing.

Finally, the spleen filters the blood in search of antigen. Upon the discovery of foreign antigen, all of these tissues react in a similar manner to amass an appropriate and multifaceted immune response.

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