4: Lymphatic System

Question 0

What is the pathway of the Lymphatic Vessels ?

Answer 0

Lymphatic capillaries–>Lymphatic Venules & Veins–>Lymphatic Ducts (Right Lymphatic Duct & Thoracic Duct)

Question 1

What is Lymph?

Answer 1

1) Created in the Interstitial spaces of tissues
2) Carried away by lymphatic vessels
3) Put back into the circulation

Question 2

What is the left subclavian vein drained by?

Answer 2

The thoracic duct

Question 3

What is the right subclavian vein drained by?

Answer 3

The right lymphatic duct

Question 4

What are lymph nodes?

Answer 4

***FILTERS

“beads” or “swellings” along certain lymphatic vessels.

Question 5

What is happening when lymph nodes are swollen?

Answer 5

• Infection at the site b/c of bacteria or viruses.

- cancer

Question 6

Where are lymph nodes most extensive ?

Answer 6

In breast, neck, axilla, abdomen, thorax, pelvis & groin.

Question 7

What was Edema caused by? Give some examples

Answer 7

1) excess filtration; increased Pc 2) decreased absorption; decreased Pi C. 3) increased capillary permeability 4) blocked lymphatics

Examples: Lymphedema/Elephantiasis

Question 8

Where is the Thymus located? Function?

Answer 8

In mediastinum

• largest in puberty; regresses in adults
• Produces WBCs, especially T-lymphocytes

Question 9

What are Tonsils?

Answer 9

Essentially clusters of WBCs hanging out in the pharynx.
Three types: 
1) Pharyngeal (adenoids)
2) Palatine
3) Lingual

Question 10

Where is the Spleen located? What is a splenectomy?

Answer 10

• LUQ
• Often injured in abdominal trauma
• Splenectomy = removal of spleen

Question 11

What is MALT?

Answer 11

Mucosa associated lymphoid tissue (MALT) is the diffusion system of small concentrations of lymphoid tissue in the GI tract

Question 12

What is MALT populated by?

Answer 12

T lymphocytes, B lymphocytes, and macrophages, each of which is well situated to encounter antigens passing through the mucosal epithelium