Lymphoid I Flashcards
T cells
responsible for cell mediated immunity
B cells
responsible for humoral immunity
starry sky appearance
in the thymus due to the macrophages removing the thymocytes
thymotaxin
produced by epithelial cells to migrate from bone marrow to thymus
epithelial reticular cells
in the thymus, connected by desmosomes, present antigens to immature T cells, no reticular fibers
thymosin and thymopoieten
thymic hormones
Which cells contribute to the blood thymus barrier
ERCs
Where do immunocompetent T cells exit the thymus?
thick endothelium of the medulla
Hassal corpuscles
concentric layers of epithelial cells in the medulla of the thymus
thymic stromal lymphopoietin (TLSP)
stimulates the differentiation of regulatory T cells
Parenchyma of the thymus is replaced with what during involution?
adipose tissue
MALT
mucosa associated lymphoid tissue
nodular lymphoid tissue
where B cells recognize antigen in secondary lymphoid organs, supported by reticular fibers
diffuse lymphoid tissue
where T cells are activated in the thymus
germinal center
location of B cell activation and initial differentiation
palatine tonsil (paired)
stratified squamous epithelium, lateral walls of the fauces
pharyngeal tonsil (single)
pseudostratified ciliated columnar epithlium, posterior wall of the nasopharynx
lingual tonsil (multiple)
stratified squamous epithelium, posterior tongue
peyer patch
in the intestinal muscosa and submucosa, nodules and diffuse lymphoid tissue for antigen sampling
M cells
speicialized epithelial cells that form pockets and allow lymphocytes to sample antigen
functions of appendix
reserve of gut flora, endocrine role, immune surveillance
