1. Chapter 16: The Lymphatic System and 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. Functions of the Lymphatic System
Learning Outcome
List the 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✓
Functions of the Lymphatic System
Checkpoint 16-1 What are the three functions of the lymphatic system? 7

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

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.12

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? 14

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

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17. Lymphatic Circulation✓
Lymphatic Circulation
Checkpoints 16-2 What are the two differences between blood capillaries and lymphatic capillaries? 16-3 What are the two main lymphatic vessels? 17

18. Lymphatic Circulation?
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.

19. Lymphatic Circulation?
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.

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

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

22. Figure 16-5 Location of lymphoid tissue.22

23. Lymphoid Tissue Lymph Nodes Cervical nodes Axillary nodes
Tracheobronchial
Mesenteric nodes
Inguinal nodes

24. Figure 16-3 Vessels and nodes of the lymphatic system.
What are some nodes
that receive lymph
drainage from the
breast? 24

25. 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

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

27. 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

28. 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

29. Figure 16-6 Location of the tonsils.29

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

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32. ✓
Lymphoid Tissue
Checkpoints 16-4 What is the function of the lymph nodes? 16-5 What is filtered by the spleen? 16-6 What kind of immune system cells develop in the thymus? 16-7 What is the general location of the tonsils? 32

33. ?
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

34. ?
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

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

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

37. Figure 16-7 Infectious mononucleosis.37

38. Figure 16-8 Lymphangitis. 38

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

41. Figure 16-9 Reed-Sternberg cell.41

42. Disorders of the Lymphatic System and Lymphoid Tissue✓
Disorders of the Lymphatic System and Lymphoid Tissue
Checkpoints 16-8 What is lymphadenopathy? 16-9 What is lymphoma and what are the two examples of malignant lymphoma? 42

43. Disorders of the Lymphatic System and Lymphoid Tissue?
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

44. Disorders of the Lymphatic System and Lymphoid Tissue?
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

45. Case Study Learning Outcome
6. Describe the spleen’s functions and the consequences of its removal. 45

46. 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

47. Word Anatomy Learning Outcome
Show how word parts are used to build words related to the lymphatic system. 47

48. Word Anatomy Word Part Meaning Example -oid like, resembling
Lymphoid tissue makes up the specialized organs of the lymphatic system.
aden/o
gland
The adenoids are gland-like tonsils.
lingu/o
tongue
The lingual tonsils are at the back of the tongue.
-pathy
any disease
Lymphadenopathy is any disease of the lymph nodes.
-megaly
excessive enlargement
Splenomegaly is excessive enlargement of the spleen.

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