Flashcards in Histology: Lymphoid Organs Deck (12)
What are the primary lymphoid organs?
- Bone Marrow
What are the secondary lymphoid organs?
- Lymph Nodes
- Mucosal Associated Lymphoid Tissue
What are the components of the thymus?
What cells predominate in the cortex?
T- cells with fewer epithelial cells
What are Hassall's Corpuscles?
Concentric structure - thought to be degenerated epithelial cells
How does the thymus change in the adult?
Most of the thymus becomes replace with adipose tissue
What are the 3 parts of the lymph node?
What is the space right below the capsule?
What are germinal centers?
Sites of B cell proliferation - follicle with germinal center is referred to as a secondary follicle
What is the periarteriolar lymph sheath?
They are a portion of the white pulp of the spleen. They are populated largely by T cells and surround central arteries within the spleen; the PALS T-cells are presented with blood borne antigens via myeloid dendritic cells.
What are the components of the red pulp?
- Open sinuses
- Cellular cords