Lymphoid Tissue - Lymphoid Tissue reticular connective...

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Lymphoid Tissue: lymphoid organs - diffuse lymphatic tissue: scattered reticular tissue elements - lymphatic nodules: o germinal centers: Lymphoid Organs: Thymus : bilobed organ in inferior neck extending into mediastinum - functions in maturation of T cells; mostly in childhood - size decreases with age as most tissue replaced by connective tissue - thymic lobules each contain a cortex and medulla with lymphocytes (T cells); medulla contains Hassal’s corpuscles (appear red) - thymocytes (epithelial cells in stroma) secrete hormones (thymosins) for development of T cells Lymph Nodes: hundreds of small organs that cluster along lymphatic vessels - filter lymph: macrophages in lymph nodes remove debris & destroy microorganisms - activate immune system: lymphocytes within follicles monitor lymph for foreign antigens & mount responses against them
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This note was uploaded on 12/04/2011 for the course ANTHRO 2000 taught by Professor Monicaoyola during the Fall '10 term at Broward College.

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Lymphoid Tissue - Lymphoid Tissue reticular connective...

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