The lymphoid system is an interrelated series of organs that protect the body from invasion by foreign substances. Its functions are integrated by humoral and cellular messages carried by blood and lymph. The structural complexity of the components of this system ranges from the relatively simple diffuse tissues in the lamina propria of the digestive tract to the complex parenchyma of the spleen. The common denominator is the lymphoid tissue, a morphologically homogenous but functionally heterogenous population of lymphocytes, associated with a delicate threedimensional reticulum of cells or of cells and fibers (Fig. 10.1).
KeywordsLymphoid Tissue Germinal Center Lymphoid Organ Reticular Cell White Pulp
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