1. Lymphatic System Chapter 20
What is an Infectious Disease?://
Chapter 20

2. Functions Transport and balance fluids Use lymphatic vessels
Carry cells, molecules, water, and possibly pathogens
Carry fluids away from tissue space to bloodstream

3. Functions 2. Protection against foreign invaders
Destroy microorganisms (bacteria, fungus, protists) and viruses
Attack toxins and cancer cells
Can cause cancer, allergies, and autoimmune disease

4. Along lymph vessels are lymph nodes that act as filters, trapping disease-causing microorganisms

5. What makes up the Lymphatic Pathway?
1. Lymph is the fluid
2. Lymphatic capillaries- microscopic closed ended tubules found laying within the tissue space near blood capillaries
3. Lymphatic vessels- larger lymph vessels similar to veins
lead toward and away from lymph nodes
4. Lymph node- specialized lymph organs that contain WBC to filter lymph and kill pathogens, back to
5. Lymphatic trunk- larger lymph vessels formed from merging lymphatic vessels and drain lymph into collecting ducts

6. Lymph Capillaries

7. The Lymphatic System FG23_01.JPG Title: Lymphatic System
Notes: An overview of the arrangement of lymphatic vessels, lymph nodes, and lymphoid organs.
Keywords: lymphatic system, components, lymph nodes, cervical, axillary, pelvic, inguinal, lumbar, right lymphatic duct, thoracic lymphatic duct, mammary gland, spleen, gut-associated, cisterna chyli, thymus, lymphatics of lower limb

8. What makes up the Lymphatic Pathway?
6. Collecting ducts- major areas in which lymph is collected and returned to the cardiovascular system
a. THORACIC duct- on left side, larger receives lymph from lower limbs, abdominal regions, L upper limb, and L side of thorax
empties into left subclavian vein
b. LYMPHATIC duct- smaller, right side, receives lymph from R side of head, R upper limb, and R thorax
empties into R subclavian vein

9. What makes up the Lymphatic Pathway?
Water leaves blood capillary  tissue space lymphatic capillary lymphatic vessels  lymph node  lymphatic vessel  lymphatic trunk  collecting ducts
(right lymphatic and thoracic duct)  right and left subclavian vein superior vena cava

10. Lymphatic Vessels

11. Organs of the Lymphatic System
Thymus- “T-cell Academy”- soft. Bi-lobed structure anterior to heart (near atria)
large during infancy, contains T cells (T lymphocytes) , when cells mature, they leave thymus and provide immunity
Shrinks following puberty, continues to shrink with age, reduces immune power

12. Thymus Gland FG23_16A.JPG Title: The Thymus
Notes: (a)Location of thymus on gross dissection. (b)Anatomical landmarks on thymus. (c)Low-power light micrograph of thymus. (d)Higher magnification showing structure of Hassall's corpuscles.
Keywords: thymus, gross dissection, thyroid, trachea, lobe, septae, lobule, cortex, medulla, blood vessels, Hassall's corpuscles, epithelial cells, lymphocytes

13. Organs of the Lymphatic System
2. Spleen- large organ inferior to diaphragm, posterior and lateral to stomach
large amounts of blood pass through spleen, filters for viruses and bacteria
Hematopoiesis- development of agranular leukocytes (mono- and lymphocytes)
Defense- Contains lymphocytes and macrophages
Removes old RBCSs

14. Organs of the Lymphatic System
BONE MARROW- spongy part of long bones in body
Helps with hematopoiesis (birth of blood cells)
Makes RBCS daily
Makes WBCs- defense
against pathogens
Platelets- blood clotting
Red vs. yellow marrow

15. Tonsils
Trap bacteria and viruses that may enter respiratory and/ or digestive system
Contain antibodies to fight against common diseases like pneumonia, flu, common bacteria, etc.

16. The Lymphatic System FG23_01.JPG Title: Lymphatic System
Notes: An overview of the arrangement of lymphatic vessels, lymph nodes, and lymphoid organs.
Keywords: lymphatic system, components, lymph nodes, cervical, axillary, pelvic, inguinal, lumbar, right lymphatic duct, thoracic lymphatic duct, mammary gland, spleen, gut-associated, cisterna chyli, thymus, lymphatics of lower limb