4: Lymphatic System Flashcards Preview

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Flashcards in 4: Lymphatic System Deck (13):
0

What is Lymph?

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

1

What is the pathway of the Lymphatic Vessels ?

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

2

What is the left subclavian vein drained by?

The thoracic duct

3

What is the right subclavian vein drained by?

The right lymphatic duct

4

What are lymph nodes?

***FILTERS
"beads" or "swellings" along certain lymphatic vessels.

5

What is happening when lymph nodes are swollen?

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

6

Where are lymph nodes most extensive ?

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

7

What was Edema caused by? Give some examples

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

Examples: Lymphedema/Elephantiasis

8

Where is the Thymus located? Function?

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

9

What are Tonsils?

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

10

Where is the Spleen located? What is a splenectomy?

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

11

What is MALT?

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

12

What is MALT populated by?

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