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Lymph is tx from lymph capillaries through successively larger lymphatic vessels called
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Lymphatic collecting vessels
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From the lymphatic collecting vessels, the lymph is returned to the venous sytem through 2 large ducts:
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R lymphatic duct and thoracic duct
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R lymphatic duct drains lymph from
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The right arm and the right side of head and thorax
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Thoracic duct drains lymph from
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The rest of body
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Both ducts empty lymph into
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Subclavian vein on their own side of body
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3 mechanisms by which lymph moves through vessels
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Skeletal muscle "milking action," pressure changes in thorax during breathing, and smooth muscles in walls of larger lymphatics
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Function of lymph nodes (2 main ideas)
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Remove foreign material such as bacteria and tumor cells from lymphatic stream and produce lymphocytes
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Shape and size of lymph nodes
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Most are kidney-shaped and less than 1 inch
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Each node is surrounded by a
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Fibrous capsule
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Strands that extend inward to divide the node into a number of compartments are called:
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Trabeculae
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The cortex of the node contains collections of lymphocytes called
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Follicles
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Many follicles (in node) have dark-staining centers called
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Germinal centers = they enlarge when specific lymphocytes (B cells) are generating daughter cells called plasma cells, which release antibodies
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What cells circulate continuously performing their surveillance role
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T cells
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Phagocytic macrophages are located in the
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Central medulla of lymph node
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Common feature in all lymphoid organs
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Predominance of reticular connective tissue and lymphocytes
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