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The spleen is covered by an outer dense irregular connective tissue capsule, which sends radiating trabeculae into the organ's interior. Suspended between trabeculae is a communicating network of reticular fibers, with many attached macrophages and reticular cells. Unlike other lymphoid organs, the spleen does not have a cortex and medulla. It consists of white pulp and red pulp, so named because of their color in the fresh state. White pulp is made of grayish white islands of lymphoid tissue, most surrounding a central arteriole to form periarteriolar lymphatic sheaths (PALS). T cells are fou...