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Flashcards in lymphatics Deck (17)
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1

why we have a lymphatic system

fluid leaves blood because of hydrostatic pressure into interstitial space
needs to be returned otherwise get oedema and loss of blood volume
lymphatic system excess extracellular drain fluid back to the blood
also ensure foreign bodies are in contact with the immune system, filter lymph

2

lymphodema

when remove the lymph nodes - because of infection
painful
unsightly
unable to drain fluid

3

what is the lymphatic system

network of vessels with lymph vessels, lymph nodes, and lymph
tonsils, adenoids, spleen and thymus
lymph moves in 1 direction
600-700 nodes in human - filter lymph before return to vessels
trunks carry fluid
nodes - expansions

4

components of the lymphatic system

nodes in neck
tonsils
thoracic duct
vessels in chest
nodes in axillary
spleen
nodes ion groin
nodes behind knee
appendix
vessels of abdomen
thymus gland

5

drainage of the lymphatic system

upper R quadrant - head, neck, limb and thorax - into R subclavian vein
rest of body - thoracic duct to from R to L side of neck, L subclavian trunk and internal jugular junction

6

lymph circulation

pumped up by muscles in the lower limbs and arterial pulses
unidirectional - valves
slow and sporadic
cell debris and by products empty into the lymph
filtered in lymph node and are returned to blood circulation

7

anatomy of lymph node

2.5cm
contain lymphocytes and macrophages
act on foreign bodies
when enlarged - signify drainage from infected regions
in armpit, groin, neck

8

enlarged lymph node

common - children, in contact with infection (resp)
less common - cancer - TB, HIV, arthritis, reaction to drugs

9

lymph

clear and odourless mostly
opaque and milky from SI - absorbed fats - chyle
contain wbc, cell debris and fats from interstitial fluid

10

where is the lymphatic drainage of the thorax

breast
thoracic wall
lungs
heart
thoracic duct
heart

11

treatment of breast cancer

remove lymph nodes
prevent recurrence and spread of primary tumour

12

lymphatics of the thoracic wall

drain into nodes associated with: internal thoracic arteries (anterior of chest wall) - parasternal, ribs - intercostal, diaphragm - diaphragmatic
all flow upwards
parasternal and upper intercostal - drain into bracheomediastinal trunks
lower intercostal - thoracic duct
diaphragmatic - brachiocephalic, aortic/lumbar
superficial - auxiliary or parasternal

13

thoracic duct

vessel in back of chest
from L2
begins at cisternae chyli - drain abdomen, pelvis, peritoneum and lower limbs
enters thorax behind oesophagus, through the diaphragm
size of phrenic nerve
centre of vertebral column
ascends on R of midline between aorta and aygous vein - at T5 cross onto L

14

lymphatics of the lungs

tracheobronchial
around bronchi and trachea
come from in hilum of lung because in lungs in pleural cavity
combine with brachiocephalic and parasternal nodes - anterior to brachiocephalic veins - form brachiomediastinal trunks
parasternal nodes run either side of the sternum

15

lymphatics of the heart

follow coronary arteries
drain into brachiocephalic and tracheobronchial nodes

16

lymphatics of the posterior mediastinum

nodes on aorta get lymph from - oesophagus, diaphragm, liver, pericardium
drain into thoracic duct and posterior mediastinal
cancer 0f liver/oesophagus drain into these areas

17

pulmonary ligament

extension of the lung hilum
allows expansion of the lung