Lymphatic System.ppt for medical study purpose

Study for medical

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LYMPHATIC SYSTEM

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The Lymphatic and Immune SystemsThe Lymphatic and Immune Systems
•Main structures of the lymphatic system
•Lymphatic vessels
•Main components of the immune system
•Lymphocytes, lymphoid tissue, and lymphoid
organs

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Parts of lymphatic systemParts of lymphatic system
•Lymphatic vessels
•Lymphatic organs and tissues

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The Lymphatic SystemThe Lymphatic System
•Lymphatic vessels
collect lymph from
tissues of body
•Carry fluid to great
veins in the neck
•Fluid flows only
toward the heart
•Lymph is clearless
fluid(blood –red
blood cells)
Figure 20.1

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Parts of Lymphatic VesselsParts of Lymphatic Vessels
•Lymph capillaries – smallest – first receive lymph
• Afferent Lymphatic vessels – collect from lymph
capillaries
•Lymph nodes – scattered along collecting vessels
• Efferent Lymph vessels–collect from lymph nodes
•Lymph trunks – collect lymph from collecting vessels
•Lymph ducts – empty into veins of the neck

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Functions of Lymphatic VesselsFunctions of Lymphatic Vessels
•Collect excess tissue fluid and blood proteins
•Return tissue fluid and blood proteins to
bloodstream

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Location and Structure of Lymph CapillariesLocation and Structure of Lymph Capillaries
Figure 20.2a, b

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Lymphatic Collecting VesselsLymphatic Collecting Vessels
•Accompany blood vessels
•Contain more valves

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Lymph NodesLymph Nodes
•Clean the lymph from pathogens
•Human body contains approximately 500
•Lymph nodes are organized in clusters

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Lymph NodesLymph Nodes
Figure 20.3

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Microscopic Anatomy of a Lymph NodeMicroscopic Anatomy of a Lymph Node
Figure 20.4a

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The Lymphatic TrunksThe Lymphatic Trunks
Figure 20.5a

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Lymphoid TissueLymphoid Tissue
1.Mucous membranes= of Digestive, urinary,
respiratory, and reproductive tracts
2.Lymphoid organs

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Lymphoid OrgansLymphoid Organs
•Spleen
•Tonsil
•Thymus
Figure 20.8

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SpleenSpleen
•Largest lymphoid organ
• Found in abdomen
• functions
•Removal and destruction of old/defective blood
cells
•Site of hematopoiesis in the fetus

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SpleenSpleen
Figure 20.9a, b

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ThymusThymus
• Found behind the sternum
• Site for maturation T lymphocytes
•Most active in childhood

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TonsilsTonsils
•Simplest lymphoid organs
•Found in beginning of digestive and respiratory
systems

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The Immune SystemThe Immune System
•Recognizes specific foreign molecules
•Destroys pathogens effectively
•Key cells – lymphocytes
•Also includes lymphoid tissue and lymphoid
organs

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LymphocyteLymphocyte
•Lymphocytes originate in bone marrow
•Some travel to the thymus gland
•T lymphocytes
•Some stay in bone marrow
•B lymphocytes
•Able to recognize a unique antigen