Immunology Flashcards
What class of lymphoid organ is a lymph node ?
Secondary
Functions of lymph node
Filtration by macrophages
Activation /Storage of B and T cells
Where are B-cells located at in the lymph node ?
Follicle
2nd Follicle has active germinal center
Where are T cells found in the Lymph node
Paracortex (in-between the cortex and medulla)
What are found in the medulla of a lymph node
Macrophages and reticular cells
What part of a lymph node may be under developed in DiGeorge Syndrome ?
Paracorted (where the T cells are)
Lymph drainage : Upper limb and Lateral breast
Axillary
Lymph drainage : Stomach
Celiac
Lymph drainage : Duodenum Jejunum
Superior mesenteric
Lymph drainage : Sigmoid colon
Inferior mesenteric
Rectum (Above the pectinate line)
Internal iliac
Lymph drainage : Anal Canal
Superficial inguinal
Testes
Para-aortic
Scrotum
Superficial inguinal
Thigh
Superficial inguinal
Lateral Side of dorsum of foot
Popliteal
Three Major Forms of MHC HLA’s
HLA A,B,C
What CD molecule on T Cells is associated with binding MHC I on nucleated cells ?
CD8
MHC I presents what kind of antigens ?
Intracellular Peptide (loaded in the ER)
What molecule does MHC I pair with to get to the cell surface ?
B2 Microglobulin
What are the three main forms of MHC II molecules ?
HLA DP, DQ and DR
What CD molecule on T-Cells is associated with binding of MHCII on APC’s ?
CD4
What are the APC’s (Only cells that express MHC II)
B-cells , Macrophages, Dendritic Cells
Where kind of antigens are loaded on MHC II ?
Mostly extracellular, packed in endosomes