PARA 438 Study Guide - Midterm Guide: High Endothelial Venules, White Pulp, Germinal Center

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Compare and contrast the b-cell area vs. the t-cell area of a lymphoid organ, and identify the organs that contain each type of area. T cell area is on the outside, surrounding the b cell area. Lymph nodes and spleen have anatomical segregation of cell types. B cell area contains the germinal centre, which is the spot where b cells are actively dividing. In the resting state, there are nothing but primary follicles. Upon antigen exposure, these become secondary follicles, and then germinal centres. The t-cell area lines the b-cell area, because b cells need help from the cd4+ cells to function. The high endothelial venule is where the lymph comes in via the afferent lymphatic vesicle, before draining out of the efferent lymphatic vesicle. Within the white pulp of the spleen, which is where lymphocytes are activated, there are t-cell areas (peri-arteriolar lymphoid sheaths) and b cell areas (lymphoid follicles with germinal centers).

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