Lymphatics (Ch 24) Flashcards Preview

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Flashcards in Lymphatics (Ch 24) Deck (16):
1

Functions of the Lymphatic System

1. return excess fluid to bloodstream
2. maintain blood volume level
3. transport dietary lipids (waxes/fats - not absorbed by GI tract)
4. generates immune response
-->lymphacytes (WBCs) monitor blood/internal fluid to detect antigens

2

Lymph Vessels

merge to form lymphatic ducts/trunks
-reabsorb excess fluid and return it to venous circulation

3

Lymph

excess interstitial fluid and solutes (sometimes foreign material)

4

Lymph + Lymph Vessels =

-secondary venous drain system
-shortcut from capillary bed to the heart

5

Lymphatic Capillaries

one way valves that open for interstitial fluid, merge into lymphatic vessels

6

Lymphatic Ducts

responsible for draining specific parts of the body
1. Thoracic Duct
2. Right Lymphatic Duct

7

Thoracic Duct

starts in posterior abdomen as cistern chyli (large vessel that holds fluid, inferior to diaphragm) --> drains into L venous angle --> heart
*drains lymph from lower limbs, L abdomen, L thorax, L upper limb, L head/neck

8

Right Lymphatic Duct

*drains R upper limb, R thorax, R head/neck

9

Lymphedema

accumulation of fluid due to blocked lymph duct

10

What are the primary lymphatic organs?

--> sites for lymphocyte formation/maturation
1. Red Bone Marrow
2. Thymus

11

Red Bone Marrow

-produce B and T cells
-B cells mature here
-located in long bones

12

Thymus

-located in anterior mediastinum, superior, covers great vessels and heart
-bilobed
-prominent in children --> atrophies --> replaced by adipose tissue
-T cells mature here

13

What are the secondary lymphatic organs?

--> populated with lymphocytes from primary organs, series of filters for blood
1. Spleen
2. Lymph Nodes
3. Tonsils

14

Spleen

in abdomen on L side
-largest, destroys pathogens/old blood cells
-blood flows through, white pulp monitors for foreign materials --> red pulp destroys old RBCs

15

Lymph Nodes

circular nodules of lymphatic material distributed throughout body
-remove pathogens from lymph
-all over body: clusters at neck (cervical), armpits (axillary), groin (inguinal)
-lymph enters through vessels and exits out different vessels
-lymph seeps through sinuses in node = foreign materials destroyed/pathogens removed

16

Tonsils

--> destroy pathogens entering body
1. Pharyngeal- on superior border of pharynx
2. Palatine- back of palate
3. Lingual- back of tongue