Lymphatic Tissues and OrgansLymphatic cells are organized into tissues and organs based on how tightly the lymphatic cells are arranged and whether the tissue is encapsulated by a layer of connective tissue. Three general categories exist: Diffuse, unencapsulated bundles of lymphatic cells. This kind of lymphatic tissue consists of lymphocytes and macrophages associated with a reticular fiber network. It occurs in the lamina propria (middle layer) of the mucus membranes (mucosae) that line the respiratory and gastrointestinal tracts.•Discrete, unencapsulated bundles of lymphatic cells, called lymphatic nodules (follicles). These bundles have clear boundaries that separate them from neighboring cells. Nodules occur within the lamina propria of the mucus membranes that line the gastrointestinal, respiratory, reproductive, and urinary tracts. They are referred to as
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lymphatic cells, lymphatic nodules, Tissues and Organs