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Chapter 16: The Lymphatic System and Lymphoid Tissue

Chapter 16: The Lymphatic System and Lymphoid Tissue. Overview. Key Terms. adenoid lymphadenopathy lymphoma chyle lymphangitis spleen lymph lymphatic duct thymus lymphadenitis lymph node tonsil. The Lymphatic System. System of tissues and vessels Scattered throughout the body

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Chapter 16: The Lymphatic System and Lymphoid Tissue

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  1. Chapter 16:The Lymphatic Systemand Lymphoid Tissue

  2. Overview

  3. Key Terms adenoid lymphadenopathy lymphoma chyle lymphangitis spleen lymph lymphatic duct thymus lymphadenitis lymph node tonsil

  4. The Lymphatic System • System of tissues and vessels • Scattered throughout the body • Services almost all regions

  5. Learning Outcome List the functions of the lymphatic system. Functions of the Lymphatic System

  6. Functions of the Lymphatic System Three Main Functions • Fluid balance (lymph) • Protection from infection • Absorption of fats

  7. ✓ Functions of the Lymphatic System Checkpoint 16-1What are the three functions of the lymphaticsystem?

  8. Learning Outcomes Explain how lymphatic capillaries differ from blood capillaries. Name the two main lymphatic ducts and describe the area drained by each. Lymphatic Circulation

  9. Lymphatic Circulation • One-way system • Begins in tissues • Ends in bloodstream

  10. Figure 16-1 The lymphatic system in relation to the cardiovascular system. What type of blood vessel receives lymph collected from the body?

  11. Lymphatic Circulation Lymphatic Capillaries • Capillary walls (endothelium) are flattened epithelial cells. • They are more permeable than blood capillaries. • Overlapping cells form one-way valves. • They arise blindly (closed at one end). • Lacteals absorb digested fats.

  12. Figure 16-2 Lymphatic drainage in the tissues.

  13. Lymphatic Circulation Lymphatic Vessels • Superficial and deep sets • Right lymphatic duct • Thoracic duct (left lymphatic duct) • Cisterna chyli

  14. Figure 16-3 Vessels and nodes of the lymphatic system. What are some nodes that receive lymph drainage from the breast?

  15. Lymphatic Circulation Movement of Lymph • Movement of lymph toward heart caused by: • Valves in lymphatic vessels • Contraction of lymphatic vessels • Skeletal muscle contraction • Breathing

  16. ✓ Lymphatic Circulation Checkpoints 16-2What are the two differences between bloodcapillaries and lymphatic capillaries? 16-3What are the two main lymphatic vessels?

  17. ? Lymphatic Circulation Pop Quiz 16.1 Which of the following is NOT characteristic of lymphatic vessels? A) They have thin walls. B) They are blind-ended. C) They can contract to propel lymph. D) They transport lymph to the tissues.

  18. ? Lymphatic Circulation Pop Quiz Answer 16.1 Which of the following is NOT characteristic of lymphatic vessels? A) They have thin walls. B) They are blind-ended. C) They can contract to propel lymph. D) They transport lymph to the tissues.

  19. Learning Outcome List the major structures of the lymphatic system and give the locations and functions of each. Lymphoid Tissue

  20. Lymphoid Tissue • Distributed throughout the body • Makes up specialized organs of lymphatic system

  21. Figure 16-5 Location of lymphoid tissue.

  22. Lymphoid Tissue Lymph Nodes • Cervical nodes • Axillary nodes • Tracheobronchial • Mesenteric nodes • Inguinal nodes

  23. Figure 16-3 Vessels and nodes of the lymphatic system. What are some nodes that receive lymph drainage from the breast?

  24. Figure 16-4 Lymph nodes. What type of lymphatic vessel carries lymph into a node? What type of lymphatic vessel carries lymph out of a node?

  25. Lymphoid Tissue The Spleen • Cleanses blood • Filtration • Phagocytosis • Destroys old red blood cells • Produces red blood cells before birth • Is a reservoir for blood

  26. Lymphoid Tissue The Thymus • Plays a key role in early immune system development • Produces thymosin • Develops T-lymphocyte cells • Promotes lymphocyte growth • Promotes lymphoid tissue activity • Shrinks after puberty

  27. Lymphoid Tissue The Tonsils • Remove contaminants and trap pathogens • Palatine tonsils • Pharyngeal tonsil (adenoids) • Lingual tonsils • Surgery to treat if recurrent infection or enlarged tonsils make swallowing or breathing difficult

  28. Figure 16-6 Location of the tonsils.

  29. Lymphoid Tissue Other Lymphoid Tissue • Appendix • Mucosal-associated lymphoid tissue (MALT) • Gut-associated lymphoid tissue (GALT)

  30. ✓ Lymphoid Tissue Checkpoints 16-4What is the function of the lymph nodes? 16-5What is filtered by the spleen? 16-6What kind of immune system cells develop in the thymus? 16-7What is the general location of the tonsils?

  31. ? Lymphoid Tissue Pop Quiz 16.2 Lymph from the arm and breast passes through which of the following? A) Inguinal nodes B) Cervical nodes C) Axillary nodes D) Tracheobronchial nodes

  32. ? Lymphoid Tissue Pop Quiz Answer 16.2 Lymph from the arm and breast passes through which of the following? A) Inguinal nodes B) Cervical nodes C) Axillary nodes D) Tracheobronchial nodes

  33. Learning Outcome Describe the major lymphatic system disorders. Disorders of the Lymphatic System

  34. Disorders of the Lymphatic System and Lymphoid Tissue Disorders Related to Infection • Lymphadenopathy • Lymphadenitis • Infectious mononucleosis Lymphedema • Elephantiasis

  35. Figure 16-7 Infectious mononucleosis.

  36. Figure 16-8 Lymphangitis.

  37. Disorders of the Lymphatic System and Lymphoid Tissue • Splenomegaly • Lymphoma • Hodgkin lymphoma • Non-Hodgkin lymphoma

  38. Figure 16-9 Reed-Sternberg cell.

  39. ✓ Disorders of the Lymphatic System and Lymphoid Tissue Checkpoints 16-8What is lymphadenopathy? 16-9 What is lymphoma and what are the two examplesof malignant lymphoma?

  40. ? Disorders of the Lymphatic System and Lymphoid Tissue Pop Quiz 16.3 What is Hodgkin lymphoma? A) A benign tumor of the lymph nodes B) A malignant tumor of the lymph nodes C) A benign tumor of the spleen D) A malignant tumor of the spleen

  41. ? Disorders of the Lymphatic System and Lymphoid Tissue Pop Quiz Answer 16.3 What is Hodgkin lymphoma? A) A benign tumor of the lymph nodes B) A malignant tumor of the lymph nodes C) A benign tumor of the spleen D) A malignant tumor of the spleen

  42. Case Study • Learning Outcome • 6.Describe the spleen’s functions and the consequences of its removal.

  43. Case Study Functions of the Spleen • Filters blood • Removes worn-out old blood cells • Acts as a large lymph node, detecting and fighting disease-causing organisms Consequences of Splenectomy • Liver will take over blood filtration and RBC removal • Greater risk of infection

  44. Word Anatomy • Learning Outcome • Show how word parts are used to build words related to the lymphatic system.

  45. Word Anatomy

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