DANCEST 805 Lecture Notes - Lecture 26: Ccl21, Antigen-Presenting Cell, Cxcl13

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Immune cells develop in primary lymphoid organs (thymus and bone marrow). Immune responses occur is secondary lymphoid tissues e. g. spleen, lymph nodes, peyer"s patches. Primary lymphoid tissues are the sites where lymphocytes differentiate to express antigen receptors (t lymphocytes from thymus and b lymphocytes from bone marrow. ) Hscs -> common lymphoid/myeloid progenitors -> megakaryocytes (precursor for platelets) or erythroblasts (precursor for rbcs). In adults, emergency haematopoiesis (e. g. due to chronic inflammation like arthritis) can occur also in the spleen, liver or lymph nodes: called extramedullary haematopoiesis. Immature t cells migrate from bone marrow to the thymus where they multiply and begin to mature. Trabeculae or septa: extensions of capsule into cortex medulla that establishes incomplete thymic lobules where blood vessels and nerves pass. Cortex: outer layer that contains many immature thymocytes. Medulla: inner layer mature t cells and hassall"s corpuscles (epithelial structures)

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