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Lymphatic System.

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Presentation on theme: "Lymphatic System."— Presentation transcript:

1 Lymphatic System

2 Lymphatic System Consists of: Lymphatic vessels Lymphatic tissues
Lymphoid organs Lymph which consists of Interstitial fluid Lymphocytes Macrophages

3 Lymphatic System


5 Functions of the Lymphatic System
Production, maintenance, distribution of lymphocytes Lymphocytes are infection fighting WBC Maintain normal blood volume Return of water and solutes that leak out into the interstitial fluid to the circulatory system Plasma protein recycling Alternate route for transport of hormones, nutrients, and waste products

6 Lymphoid Structures Primary lymphoid structures
Structures that produces lymphocytes Bone marrow, thymus, spleen Secondary lymphoid structures Places where the immune response begins Lymph nodes, tonsils

7 Lymphatic capillaries


9 Lymphatic Vessels Carry lymph from peripheral tissue to venous system
Like veins, they go from small to large and have valves System has no pump, and is unidirectional Vessel system goes as follows: Lymph capillaries Lymph collecting vessels Lymph nodes Lymph trunks Lymph ducts

10 Lymph Ducts Lymph trunks empty into the lymph ducts
Lumbar trunk Intestinal trunk Bronchomediastinal trunk Subclavian trunk Jugular trunk Two major lymph ducts Thoracic duct Right lymphatic duct Ducts return lymph to venous circulation at the L and R subclavian veins


12 Lymph and Disease Any materials in the interstitial fluid can be picked up by the lymphatic system Pathogens in the tissues can get into the lymph and travel throughout the body Lymph nodes “inspect” the lymph for foreign material Swollen or tender nodes can indicate an immune response to pathogens in the lymph

13 This looks bad! Elephantiasis
Blockage of the lymphatic return system by a worm Causes gross swelling(edema) of the tissue due to fluid build up Can be cured Don’t worry the worm doesn’t live in San Diego

14 Lymphocytes Lymphocytes are types of WBC
Responsible for specific immunity to pathogens Two major types of lymphocytes B cells: produce antibody for humoral immune response T cells: cell-mediated immunity T helper cells, cytotoxic T cells, and suppressor T cells are the major types

15 Origin of B cells and T cells
Both types of cells originate in the bone marrow B cells mature in the bone marrow hence the name B cells T cells originate in the bone marrow but move to the thymus gland to mature, hence the name T cells Both T cells and B cells are found in various lymphatic tissues

16 Lymphoid tissue and organs
Tonsils Lymph nodes Spleen Thymus

17 Tonsils Lymphoid nodules found in the pharynx
Aggregation of lymphocytes that remove pathogen from air or food Usually 5 tonsils Single pharyngeal tonsil (adenoids) Pair of palatine tonsils Pair of lingual tonsils


19 Lymph Node

20 Lymph Node





25 Spleen Soft, pulpy organ wedged between the stomach, diaphragm and left kidney The cellular component of the spleen is called the pulp Red pulp Mostly RBC White pulp Lymphatic nodules



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