histology- lymphatic system

bone marrow

bursa of fabricius

thymus

what are the primary lymphoid organs?

bone marrow/ bursa of fabricius

which lymphoid organ matures B cells?

thymus

which lymphoid organ matures T cells?

lymph nodes

spleen

MALT

what are the secondary lymphoid organs?

mucosa associated lymphoid tissue

what is MALT?

BALT- bronchus associated lymphoid tissue

GALT- gut associated lymphoid tissue

SALT- skin associated lymphoid tissue

what are the types of MALT?

in the medullary canal of long bones and cavities of trabecular (spongy) bones

where is bone marrow located?

production of blood cells and maturation of B cells

what is the function of bone marrow?

hematopoietic cells

reticular cells

macrophages

capillaries

what are the components of the red bone marrow?

adipose tissue

what are the components of the yellow bone marrow?

red bone marrow

what is this?

yellow bone marrow

what is this?

production and maturation of T cells

the purpose of the thymus is...

more

in a young animal, is the thymus more or less active?

CT

in an old animal, the thymus is mostly composed of ....

external capsule, trabeculae, lobules

cortex- darker

medulla- light

describe the structure of the thymus

t cells and macrophages

the cortex of the thymus is composed of....

hassal's corpuscles

what composes the medulla of the thymus?

thymus

what is this?

capsule

what is this white external part?

cortex- T cells and macrophages

what is the darker, external part? what would you find here?

medulla- hassal's corpuscles

what is this light, internal part? what do you expect to find here?

trabeculae

what are these divisions coming from the capsule?

thymus

what is this?

cortex

what part of the thymus do you find T cells?

concentrical layers of reticuoendothelial cells in the medulla of the thymus

what are hassal's corpuscles?

medulla of the thymus, with hassal's corpuscles

what is this?

more

are there more or less hassal's corpuscles in the thymus of an old animal?

thymus

what is this?

birds

which species have a bursa of fabricius?

parenchymal

is the thymus tubular or parenchymal?

tubular

is the bursa of fabricius tubular or parenchymal?

tubular- MSMS

mucosa and submucosa are folded

muscularis is not folded

explain the structure of the bursa of fabricius

medulla/interior

lymphocytes migrate towards the ____ as they mature

bursa of fabricius

what is this?

lumen

what is 1?

pseudostratified columnar epithelium

what is 10?

submucosa with lymphoid follicle

what is 5?

muscularis

what is 8?

bursa of fabricius

what is this?

parenchymal

are lymph nodes tubular or parenchymal?

parenchymal-

cortex- follicles with mantle, germinal center, B lymphocytes

medulla- capillaries

what is the structure of lymph nodes?

cortex

what part of the lymph node has follicles with B cells?

interfollicular tissue in the cortex

what part of the lymph node has T cells?

lymph node

what is this?

lymph node

what is this?

pig

what species has a lymph node that has switched cortex and medulla- follicles in the center and capillaries in exterior?

parenchymal

is the spleen tubular or parenchymal?

white pulp- lymphocytes and follicles

red pulp- blood storage, in between white pulp

what are the 2 parts of the spleen?

spleen

what is this?

spleen

what is this?

mantle and germinal center

the follicles of the spleen are composed of...

tonsil

what is this?

small intestine

where are peyers patches?