Chapter 20 Lymphatic System

Chapter 20 Lymphatic System - TheLymphaticSystem Angela...

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The Lymphatic System Angela Peterson-Ford, PhD September 15, 2010 Office: E 209 [email protected]
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Chapter 20 The Lymphatic System
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Lymphatic System: Overview Consists of two semi-independent parts A meandering network of lymphatic vessels Lymphoid tissues and organs scattered throughout the body Returns interstitial fluid and leaked plasma proteins back to the blood Lymph – interstitial fluid once it has entered lymphatic vessels
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Lymphatic System: Overview Figure 20.2a
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Lymphatic System: Overview Figure 20.1a
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Lymphatic Vessels A one-way system in which lymph flows toward the heart Lymph vessels include: Microscopic, permeable, blind-ended capillaries Lymphatic collecting vessels Trunks and ducts
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Lymphatic Capillaries Similar to blood capillaries, with modifications Remarkably permeable Loosely joined endothelial minivalves Withstand interstitial pressure and remain open The minivalves function as one-way gates that: Allow interstitial fluid to enter lymph capillaries Do not allow lymph to escape from the capillaries
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Lymphatic Capillaries Figure 20.1b
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Lymphatic Capillaries During inflammation, lymph capillaries can absorb: Cell debris Pathogens Cancer cells Cells in the lymph nodes: Cleanse and “examine” this debris Lacteals – specialized lymph capillaries present in intestinal mucosa Absorb digested fat and deliver chyle to the blood
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Lymphatic Collecting Vessels Have the same three tunics as veins Have thinner walls, with more internal valves Anastomose more frequently Collecting vessels in the skin travel with superficial veins Deep vessels travel with arteries Nutrients are supplied from branching vasa vasorum
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Lymphatic Trunks Lymphatic trunks are formed by the union of the largest collecting ducts Major trunks include: Paired lumbar, bronchomediastinal, subclavian, and jugular trunks A single intestinal trunk
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Lymphatic Trunks Lymph is delivered into one of two large trunks Right lymphatic duct – drains the right upper arm and the right side of the head and thorax Thoracic duct – arises from the cisterna chyli and drains the rest of the body
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Lymphatic Trunks Figure 20.2b
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The lymphatic system lacks an organ that acts as a pump Vessels are low-pressure conduits Uses the same methods as veins to propel
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Chapter 20 Lymphatic System - TheLymphaticSystem Angela...

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