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Flashcards in Lymphatics Deck (16)
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1

Give the main functions of the lymphatic system

Tissue drainage
Return of plasma and plasma proteins
Absorbed fat transport from gut
Immunity

2

What are the main constituents of the lymphatic system?

Lymphatic vessels
Lymphatic tissues (spleen/thymus/tonsils/nodules)

3

How do lymphatic vessels differ from blood vessels?

They can also absorb proteins and other large molecules from tissue fluid

4

What is lymph made up of?

Tissue fluid and plasma proteins, and later lymphocytes and fats

5

How does tissue fluid find itself in the extracellular space?

Leaks out of blood vessels due to high hydrostatic pressure as circulation moves from the large vessels of the heart to smaller blood vessels

6

How does lymph flow in lymphatic vessels?

Reliance on muscular contractions, pressure changes and gravity
Unidirectional - presence of valves

Flow increases into ECF during infection due to protein accumulation (osmosis)

7

How does tissue fluid move from the extracellular space to the lymphatic vessels?

Through physical gaps in the vessel walls

8

What are the functions of lymph nodes?

Gives lymph its immunological functions

Adds lymphocytes and antibodies to lymph if bodily antigens are detected

Filter out inert particles from lymph (e.g. carbon)

9

How are antibodies given time to form in the lymph nodes?

Flow rate decreases after flow from a small to a large vessel

10

Describe the drainage route of lymph in the limbs

Superficial follow superficial veins, e.g. skin
Deep follow deep arteries and veins, e.g. muscles/tendons

Fascia between deep and superficial is impervious to fluid

11

Describe the drainage route of lymph in the cavities

Follow deep arteries

12

Give example of parts of the body where there are no lymphatic vessels

Eyeball
CNS
Inner ear
Cartilage
Bone

13

What is the role of the saphenous opening in the inguinal region?

Allows superficial drainage to reach the deep drainage of the lymphatic system

14

Describe possible pathologies of the lymph node

Primary tumours e.g. Hodgkin's lymphoma
Secondary tumours from metastasis
Infections e.g. TB/glandular fever
Inflammatory hyperplasia (enlargement)

15

Where does collected lymph ultimately congregate?

Right lymphatic duct

Thoracic duct

16

What is the spleen?

Largest lymphatic organ

Contains a large amount of blood, routinely discharged via smooth muscle action