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Lymphatic Tissues and Organs

Lymphatic Tissues and Organs - Lymphatic Tissues and Organs...

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Lymphatic Tissues and Organs Lymphatic 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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