21 Lymphatic system Flashcards
lymph fluid
special type?
thin fluid that resembles plasma pH 7.4
Chyle: GI tract lymph. white and cloudy, contains fats.
3-4 recycled everyday
lymphatic vessels
have flaps that are open. size on venule. has valves.
lymph flow
vessels tend to lie adjacent to cardiovascular vessels (capilleries/ veins/ arteries). movement of body assists movement of fluid
lymphagion
compression of vessel by veins/ arteries
Where does upper right quadrant drain?
into right subclavian vein
Where does the rest of the body drain?
left subclavian vein
Lymph node
shaped like a kidney
each node has multiple afferent vessels that enter the convex side and one single efferent lymph vessel that leaves via the concave hilum.
each node has a feeding artery and a draining vein next to the efferent vessel.
contain dendritic cells too
Main connective tissue in nodes?
reticulin
follicular dendritic cells
found in lymph. find bacterium and activate b cell cascade. or take it to present in the blood.
enlarged lymph nodes
increasenumber of lymphocyte causing swelling. cancers can also metastase in this way. like hodkins lymphoma or non hodgkins lymphomas in neck.
lymphathic organs
thymus, spleen, tonsils, appendix, payers patches (under mucosal membrane of small intestines)
Thymus
for maturation of t cells. mostly active in children.
spleen
rbc storage
has white pulp (like lymph) and red pulp (rbc storage)
spleen function
immune: antigen presentation, proliferation of t and b cells.
haemopoietic function: removal of old rbc and storage of rbc.
Splee clinical:
burst spleen: splenectomy as rbc burst out into system. bt now cant make moe rbc. at hihg risk of infection.
splenomegaly: enlargement due to infections. eg glandular fever or malaria.
