1. The Lymphatic System and Lymphoid Tissue
4/16/2017 7:33 AM
The Lymphatic System and Lymphoid Tissue
Anatomy & Physiology II
Chapter 16
© 2007 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

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

3. Functions of the Lymphatic System
Fluid balance
Lymph fluid
Protection from infection
Absorption of fats

4. lymphatic system in relation to the cardiovascular system
Lymphatic vessels pick up fluid in the tissues and return it to the blood in vessels near the heart. Zooming In: What type of blood vessel receives lymph collected from the body?

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

6. Lymphatic Capillaries
Capillary walls (endothelium) are flattened epithelial cells
More permeable than blood capillaries
Overlapping cells form one-way valves
Arise blindly (closed at one end)
Lacteals absorb digested fats

7. Lymphatic Vessels Superficial sets Deep sets Nodes
Right lymphatic duct
Thoracic duct (left lymphatic duct)
Cisterna chyli

8. Lymph Vessels and Lymph Nodes
Lymph nodes and vessels of the head.
Drainage of right lymphatic duct and thoracic duct into subclavian veins.

9. Movement of Lymph
Segments of vessels located between the valves contract rhythmically
Skeletal muscles compress vessels

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

11. Lymph Nodes Structure Fibrous connective tissue capsule
Afferent lymphatic vessel
Hilum
Sinuses
Cords
Nodules
Medulla
Efferent lymphatic vessel
Grouping
Cervical nodes
Axillary nodes
Mesenteric nodes
Inguinal nodes

12. Structure of a lymph node
Arrows indicate the flow of lymph through the node.
Section of a lymph node as seen under the microscope (low power).
Zooming In: What type of lymphatic vessel carries lymph into a node? What type of lymphatic vessel carries lymph out of a node?

13. The Spleen Cleanses blood Destroys old red blood cells
Filtration
Phagocytosis
Destroys old red blood cells
Produces red blood cells before birth
Is reservoir for blood

14. The Thymus Plays key role in early immune system development
Produces thymosin
Develops T lymphocyte cells
Promotes lymphocyte growth
Promotes lymphoid tissue activity
Shrinks after puberty

15. 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/breathing difficult

16. Other Lymphoid Tissue Appendix
Mucosal-associated lymphoid tissue (MALT)
Peyer patches
Gut-associated lymphoid tissue (GALT)

17. The Reticuloendothelial System
Cells responsible for destroying worn-out blood cells, bacteria, cancer cells and other harmful foreign substances
Monocytes
Macrophages
Kupffer cells
Dust cells

18. Disorders of the Lymphatic System and Lymphoid Tissue
Lymphangitis
Septicemia
Lymphadenitis
Cervical
Chronic

19. Lymphedema Tissue swelling due to obstruction of lymph flow caused by
Infection of lymphatic vessels
Vessel blockage
Malignant growth
Parasites
Loss of lymphatic vessels from injury or surgery

20. Lymphadenopathy
Enlarged lymph nodes accompany certain diseases and infections
Acquired immunodeficiency syndrome (AIDS)
Infectious mononucleosis

21. Splenomegaly
Enlarged spleen accompanies certain diseases and infections
Scarlet fever
Typhus fever
Typhoid fever
Syphilis
Tropical parasitic diseases
Splenic anemia

22. Lymphoma Any tumor in lymphoid tissue Malignant disease
Hodgkin disease
Non-Hodgkin lymphoma

23. End of Presentation