The Lymphoreticular System Flashcards
Which primary lymphoid organ is shown here?
Thymus
What feature of the thymus is shown here?
Hassall’s corpuscle
What secondary lymphoid tissue is shown here?
Lymph node
What feature of the lymph nodes in shown here?
HEV: high endothelial venule
What are the functions of the lymphoreticular system?
- Mechanism for removing excess interstitial fluid
- Transportation of fats
- Immune defence
Chyle
lymph from the digestive system. Contains protein-coated lipid droplets (chylomicrons)
Lymph drains in which direction?
Lymph drains distally to proximally in the direction of the thoracic duct.
Function of the thymus
- Where T cells are matured and are activated
Function of the spleen
- Filter the blood
- Remove old RBCs
Peyer’s patches
Lymphoid tissue specifically located in the wall of the intestine.
The Bursa of Fabricius is a primary/secondary lymphoid organ?
Primary
What primary lymphoid organ is shown here?
Bursa of Fabricius
What lymphoid organ is shown here?
Spleen
Can tell due to presence of smooth muscle
True or false: there are no afferent lymphatics entering the spleen
True: spleen receives rich blood supply, has only efferent lymphatics
Where does lymph re-enter the bloodstream?
Cranial vena cava (or in that region)
What is white pulp? In which organ is it found?
- Lymphoid tissue surrounding blood vessels
- Contains high numbers of B lymphocytes
- Found in the spleen
What is red pulp? In which organ is it found?
- Connective tissue and splenic sinusoids
- Filters the blood of antigens, microorganisms and aged/defective RBCs
- Found in the spleen
What is a Hassall’s corpuscle? Where is it found?
- Blood supply and exit for lymphatics
- Found in the thymus
What is a high endothelial venule and where is it found?
- Found in lymph node
- Where lymphocytes circulating in the blood enter the lymph node
