lymphatic system. lymphatic system: overview -consists of two semi-independent parts meandering...
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Lymphatic System
Lymphatic System: Overview
- Consists of two semi-independent parts• Meandering network of lymphatic vessels
• Lymphoid tissues and organs scattered throughout body
- Returns interstitial fluid and leaked plasma proteins back to the blood
- Lymph – interstitial fluid once it has entered lymphatic vessels
Introduction– Components
• Lymph is the fluid
• Vessels – lymphatics
• Structures & organs
– Functions• Return tissue fluid to the bloodstream
• Transport fats from the digestive tract to the bloodstream
• Surveillance & defense
The Lymphatic System
Lymph Fluid and Movement
- Once interstitial fluid in cardiovascular system leaves capillaries and enters lymph capillaries, fluid is called “lymph fluid”
- Movement- Contraction of skeletal muscles against lymphatic
vessels
- Smooth muscle contraction
- Valves in lymphatic vessels
- Breathing
- Obstruction of system leads to edema
Lymphatics– Originate as lymph capillaries– Capillaries unite to form larger vessels
• Resemble veins in structure• Connect to lymph nodes at various intervals
– Lymphatics ultimately deliver lymph into 2 main channels
• Right lymphatic duct– Drains right side of head & neck, right arm, right thorax– Empties into the right subclavian vein
• Thoracic duct– Drains the rest of the body– Empties into the left subclavian vein
Lymph Capillaries
Lymphatic Vessels
Main Channels of Lymphatics
Major Lymphatic Vessels of the Trunk
Lymph Tissue– 3 types
• Diffuse lymphatic tissue– No capsule present– Found in connective tissue of almost all organs
• Lymphatic nodules– No capsule present– Oval-shaped masses– Found singly or in clusters
• Lymphatic organs– Capsule present– Lymph nodes, spleen, thymus gland
Lymph Nodules
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