Lymphatic System Notes

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Lymphatic System Notes

  1. 1. Essentials of Human Anatomy & PhysiologyAnatomy & Physiology II The Lymphatic System Mr. Hildebrandt
  2. 2. The Lymphatic System• Lymphatic system functions: • Transport clean fluids back to the blood • Drains excess fluids from tissues • Removes “debris” from cells of body • Transports fats from digestive system Slide 12.1
  3. 3. When things go wrong…..
  4. 4. Lymphatic Characteristics• Lymph – excess tissue fluid carried by lymphatic vessels• It’s a passive system: • One way system toward the heart • No pump • Lymph moves toward the heart • Milking action of skeletal muscle • Rhythmic contraction of smooth muscle in vessel walls • Gravity effects movement
  5. 5. Lymphatic Capillaries • Fluid leaks through mini-valves into lymph capillaries • Higher pressure on the inside closes mini-valves
  6. 6. Lymphatic Vessels• Collects lymph from lymph capillaries• Delivers lymph to lymph nodes• Returns fluid to circulatory veins near the heart • Right lymphatic duct • Thoracic duct
  7. 7. Lymphatic System Structures
  8. 8. Lymph Nodes• Filter lymph before it is returned to the blood• Defense cells in nodes: • Medulla houses macrophages which engulf and destroy foreign substances • Cortex nurtures lymphocytes which provide immune response to antigens (cortex)
  9. 9. Flow of Lymph Through Nodes • Lymph enters the convex side through afferent lymphatic vessels • Lymph flows through a number of sinuses inside the node • Lymph exits through efferent lymphatic vessels • Fewer efferent than afferent vessels causes flow to be slowed
  10. 10. Lymphoid Organs• Several other organs contribute to lymphatic function • Spleen • Thymus • Tonsils • Peyer’s patches Figure 12.5
  11. 11. The Spleen• Filters blood• Destroys worn out blood cells• Forms blood cells in the fetus• Acts as a blood reservoir
  12. 12. The Thymus• Functions at peak levels only during childhood• Produces hormones (like thymosin) to program lymphocytes
  13. 13. Tonsils• Small masses of lymphoid tissue around the pharynx• Trap and remove bacteria and other foreign materials• Tonsillitis is caused by congestion with bacteria
  14. 14. Peyer’s Patches “Tonsils of the intestine”• Found in the wall of the small intestine• Capture and destroy bacteria in the intestine
  15. 15. Mucosa-Associated LymphaticTissue (MALT)• Includes: • Peyer’s patches • Tonsils • Other small accumulations of lymphoid tissue• Acts as a sentinal to protect respiratory and digestive tracts

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