The Lymphoid System Flashcards
What induces the formation of Tcytotoxic cells?
IL-2
Which lymphocytes are located in mucosa and are the first line defense?
Gamma/delta T lymphocytes
How can we identify plasma cells?
They have a lighter appearance (lots of cytoplasm) and are bigger.
Which organ atrofys with age?
The thymus, site for development of T cells.
In the tymus what is darker, the cortex or the medulla?
The cortex is darker.
The medulla is lighter.
What are Hasal’s corpuscles?
Epithelial reticular cells
Help differenciate the thymus, located in the medula
Where undergoes from the Thymus Positive selection of T cells?
At the cortex.
The outer cortex of the lymph nodes is mainly composed by…
B cells
The paracortex/inner cortex of the lymph nodes is mainly composed by…
T cells
Where are located the central arteries in the spleen?
Inside the white pulp.
What type of tissue and cells recover the central artery in the spleen?
The PeriArterial Lymphoid Sheath (PALS) formed by T cells.
What organ it is:
We can observe follicles all around the tissue.
Spleen
What organ it is:
It is very lobulated.
Thymus
What organ it is:
Presents follicles only at the external part.
Lymph nodes
To what organ are part the Cords of Billroth?
The spleen (the red pulp).
