12 - Unit #5 Unit Circulatory System Lymphatic and Immune...

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Unit #5 Unit #5 Circulatory System Circulatory System Lymphatic and Immune Lymphatic and Immune Systems Systems
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Introduction Introduction The lymphatics contain the following components: Vessels Organs (lymphatic tissue plus cells) Fluid The function of the lymphatics is to: Transport fluid lymph Return tissue fluid and proteins to the blood A one-way system f luid flows only toward the heart Immune response protection from pathogens
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Fig. 21.1 Lymphatic system Lymph duct Lymph trunk Lymph node Lymphatic capillary Blood capillaries Lymphatic collecting vessels, with valves Heart Arterial system Venous system Tissue fluid Blood capillaries Lymphatic capillaries
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Lymphatic Vessels Lymphatic Vessels Lymphatic vessels collect tissue fluid from loose connective tissue Carry fluid to great veins in the neck Once tissue fluid is within lymphatic vessels it is termed lymph Include: Lymph capillaries Lymphatic collecting vessels Lymph trunks Lymph ducts Fig. 21.1
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Lymphatic Capillaries Lymphatic Capillaries Smallest lymph vessels first to receive lymph High permeability allows entrance of: Tissue fluid and protein molecules Bacteria, viruses, and cancer cells Specialized lymphatic capillaries Lacteals Located in the villi of the small intestines Receive digested fats Fatty lymph Chyle Flaplike minivalve Fig. 21.1
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Lymphatic Collecting Vessels Lymphatic Collecting Vessels Lymphatic collecting vessels collect from lymph capillaries Lymph nodes are scattered along collection vessels Collecting vessels accompany blood vessels Composed of the same three tunics as blood vessels Contain more valves than veins one way flow Lymph propelled by: Skeletal muscles bulging, nearby arteries pulsing Tunica media of the lymph vessels Lymph flow is unaided by heartbeat
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Lymph Nodes Lymph Nodes Cleanse the lymph of pathogens Superficial lymph nodes located in Cervical, axillary, and inguinal regions Deep nodes are Tracheobronchial, aortic, and iliac lymph nodes Microscopic anatomy of a lymph node: Fibrous capsule surrounds lymph nodes Trabeculae connective tissue strands Lymph vessels afferent & efferent lymphatic vessels
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Fig. 21.2 Cervical nodes Lymphatic collecting vessels Axillary nodes Inguinal nodes Afferent lymphatic vessels Efferent lymphatic vessels Capsule Trabeculae Fig. 21.3
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Lymphatic Trunks Lymphatic Trunks The lymphatic collecting vessels converge into the lymphatic trunks There are five major lymphatic trunks Lumbar trunks receives lymph from lower limbs Intestinal trunk receives chyle from digestive
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12 - Unit #5 Unit Circulatory System Lymphatic and Immune...

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