1. Memmler’s A&P Chap 16 The lymphatic system

2. Lymphatic system p352 Functions: – Fluid balance – Absorption of fats: lacteals – Protection from infection

3. Lymphatic circulation p353 One way system of lymphatic vessels that begins in the tissues and ends when the lymph joins the blood. Lymphatic capillaries: More permeable than blood vessel capillary walls

4. Movement of lymph p355 Segments of lymphatic vessels located between the valves contract rhythmically, propelling the lymph forward. Movement of lymph is promoted by: – Valves – Skeletal muscles – Breathing

5. Lymphatic circulation p354 Superficial and deep lymphatic vessels 2 main lymphatic ducts Right lymphatic duct Thoracic duct Lymphatic ducts empty into the superior vena cava

6. Lymphoid tissue p355 Nodes Spleen Thymus Tonsils Other (appendix)

7. Lymph nodes p356 Filter lymph Sites where lymphocytes multiply

8. Spleen p357 Filters BLOOD to remove impurities and cellular debris Destroys worn-out RBCs Serves as a reservoir for blood

9. Thymus p358 The thymus is most active during early life. After puberty, the tissue undergoes changes. It shrinks in size and is replaced by connective tissue and fat.

10. Tonsils p358 3 areas of tonsils: Palatine tonsils Pharyngeal tonsils (adenoids) Lingual tonsils

11. Other lymphoid tissue p359 Appendix Peyer patches

12. Lacteals p353 Lacteals absorb fats that are too large to pass into the circulatory system Chyle More info on lacteals in Chap 19 page 420.

13. Disorders of the lymphatic system p359-360 Lymphedema Lymphadenopathy Lymphoma – Hodgkin disease – Non-Hodgkin lymphoma