Lymphoid tissue

Question 1

where are lymphocytes

Answer 1

blood
interstitial CT
lymphoid organs

Question 2

lymphoid nodule description

Answer 2

spherical accumulation of B cells
solitary or aggregates
may have germinal centers

Question 3

germinal centers

Answer 3

pal centers in activated nodules

Question 4

where is MALT

Answer 4

GALT
respiratory tract
genitourinary tract

Question 5

lymphoid organs

Answer 5

tonsils
lymph nodse
spleen
thymus

Question 6

palatine tonsils

Answer 6

stratified squamous epithelium

deep crypts

Question 7

pharyngeal tonsils

Answer 7

pseudo stratified columnar epithelium

glands and lymphoid tissue

Question 8

lingual tonsils

Answer 8

stratified squamous epithelium

one crypt per tonsil

Question 9

cortical blood thymus barrier

Answer 9

desmosomes between thymic epithelial cells to separate the thymus cortex from the blood

Question 10

hassal’s corpuscles

Answer 10

in medulla- concentric layers of epithelial reticular cells and keratin

Question 11

outer cortex of lymph node contains

Answer 11

b cells

Question 12

inner cortex of lymph node contains

Answer 12

t cells

Question 13

medullary cords of lymph node ontains

Answer 13

stacks of cells (b cells, plasma cells, macrophages)

Question 14

medullary sinuses of lymph node

Answer 14

spaces between cords surrounded by macrophages, reticular cells, and reticular fibers

Question 15

high endothelial venuoles

Answer 15

bring circulating lymphocytes to the medulla
lined by cuboidal epithelium
receptors attract lymphocytes

Question 16

spleen white pulp

Answer 16

periarterial lymphatic sheath (PALS)- t cells around the arteries and arterioles
lymphatic nodules of T cells along PALS
purple colored

Question 17

spleen red pulp

Answer 17

reticular fibers and cells surround sinusoidal capillaries
splenic cords- cells
splenic sinuses- sinusoidal capillaries
red colored

Question 18

marginal zone of spleen

Answer 18

between red and white pulp with macrophages

Question 19

lymph node reactive hyperplasia

Answer 19

enlarged lymph nodes due to infection

Question 20

follicular lymph node hyperplasia

Answer 20

humoral response

b cell proliferation

Question 21

parafollicular hyperplasia

Answer 21

t cell activation

Question 22

sinus dilation in lymph node

Answer 22

increased macrophage activity

Question 23

hodgkin’s lymphoma

Answer 23

characterized by reed-sternberg cells- tumor cells from activated t cells

Question 24

non-hodgkin’s lymphoma

Answer 24

tumor cells from b cells