The thymus is encapsulated and contains trabeculae. It has cortical and medullary regions (Figure 1-4-1). The thymus contains epithelial reticular cells and Hassall corpuscles in the medulla and lacks germinal centers. The thymus protects developing T cells by the blood-thymus barrier that consists of a capillary wall, connective tissue, a basement lamina of epithelial reticular cells, and cytoplasm of epithelial reticular cells.

Figure 1-4-1. Thymus

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