H: Immune system Flashcards
Identify
Lymphocyte
Identify
Thymus
C: capsule
Cx: cortex
M: medulla
S: interlobular septa
Identify structures in this section of the medulla of thymus
Dark blue spots: lymphocytes
Ep: epithelial cells
H: Hassal’s corpuscles - keratinised epithelial cells
Identify structures in this young cortex of thymus
Dark blue = lymphocytes
Light pink = reticular
Identify
Lymph node
C = capsule
S = subcapsular sinus
E = endothelial cells lining sinus
M= macrophages
Identify
Lymph node
C = capsule
T = trabeculae
S = subcapsular sinus
Cx = cortex
M = medulla
F = follicles with germinal centres (actively dividing B cells) surrounded by resting B cells.
P = paracortex with T cells
M = medulla
MC: medullary cords - have mature B cells
Medullary sinuses?
Spaces between medullary cords
Spleen
Largest lymphoid organ
Removes blood-borne antigens and old/defective RBCs
Site of hematopoiesis in fetus.
Function of white and red pulp in spleen?
White = thick sleeves of lymphoid tissue
Red = Surrounds white pulp, composed of splenic cords and venous sinuses.
Identify structures in spleen
WP: white pulp
RP = red pulp
C = capsule
T = trabeculae
White pulp in spleen
T cells around arteries
B cells form follicles
Red pulp in spleen
Splenic sinusoids with macrophages (sinusoid = leaky capillary)
Splenic cords (sheets of reticular CT)
Splenic artery division
Splenic artery –> central artery –> sheathed capillaries –> blood emptied into red pulp and enters sinusoids.
Identify
Palatine tonsil
E = stratified squamous epithelium
White spaces = crypts, where pus will accumulate if sick
Cap = Hemi-capsule
F = follicles with germinating entres.
Peyer’s patches - where are they found + what do they contain?
Found in distal small intestine wall
Have clusters of lymphoid follicles with germinal centres
Identify
Peyer’s patch
Gc = germinal centre
Identify
Neutrophils
Identify
Eosinophils
