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324Lecture13 lymphatic organs

324Lecture13 lymphatic organs - Lymphatic System and...

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Lymphatic System and Lymphoid Tissue
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Lymphatic System Lymph Vessels - have the same layers as veins and similar composition except less well developed. Lymph Organs Lymph Nodes, Tonsils, Thymus, Spleen Lymph Circulates in one direction only (toward heart) Composition: very similar to interstitial fluid
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Lymph Capillary, Cross Section Arrows = discontinuous basal lamina AF = anchoring fibrils
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Lymph Organs Lymphoid Organization: a) dense - compactly organized cell aggregates, lymph nodules/follicles. b) diffuse - loose and poorly defined cell collections. Occur in all loose CT. Mucosa associated lymphoid tissue (MALT) E.g. Peyer’s patches, appendix, respiratory tract, reproductive tract, urinary tract Lymph Nodules - structural units of lymph organs and solitary bodies; may be homogeneous or have cortex and medulla (germinal center = reaction center indicating dividing [active] Lymphocytes).
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Lymph Organs A. Lymph Node - occur generally in pre-vertebral region; mesenteries, omenta, hypodermis.
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