Lymphoid Organs and Tissues Flashcards
primary lymphoid organs
thymus
bursa of fabricius (only found in birds)
peyer’s patches
what is the primary function of primary lymphoid organs
regulate the lymphocyte maturation
secondary lymphoid organs
lymph nodes
spleen
tonsils
what is the primary function of secondary lymphoid organs
trap and process antigens
mature lymphocytes that mediate immune responses
located in the cranial thorax and is largest is size when animal is young
thymus
what is responsible for most of the production of T cells
thymus
T cells leave the thymus and travel where
secondary lymphoid organs
what are T cells important in stimulating
cell mediated immune response
what is found only in birds and is similar in structure and function to the thymus
bursa of fabricius
located in the wall of the small intestine, structure and functions vary upon species
peyers patches
peyers patches activate B cells to produce what
antibodies
what do secondary lymphoid organs do in response to antigenic stimuation
enlarge
small, kidney bean shaped filters in lymphatic vessels
lymph nodes
how is lymph node divided
cortex and medulla
what is located in the cortex of the lymph node
nodules
what can lymph nodes give us clues about
health of the animal
what do lymph nodes do to the the organs they are associated with
drain them
why do lymph nodes enlarge, making them more easily palpated
in response to antigenic stimulation
what diagnostic test and cytology (to evaluate abnormalities) can be used to collet a microscopic sample of the lymph node
fine needle aspiration (FNA)
tongue shaped organ located on the left side of the abdomen - near the stomach in simple stomached animals, near the rumen in ruminants
spleen
the spleen is covered with a capsule made up of what
fibrous connective tissue and smooth muscle
the capsule of the spleen sends out branches called what, into the soft tissue of the spleen
trabeculae
what does the spleen do when its smooth muscle contract
squeezes stored blood cells back into circulation
two parts of the soft tissue interior of the spleen
white and red pulp
part of the spleen that is formed of localized areas of lymphoid tissue containing lymphocytes that can clone themselves during an immune response
white pulp
part of the spleen that consists of blood vessels, tissue macrophages and blood cell storage spaces called sinuses
red pulp
what secondary lymphoid organ acts as a reservoir for blood when the animal is at rest
spleen
nodules of lymphoid tissue that are covered with a capsule
tonsils
what do the tonsils in the throat do
prevent the spread of infection into the respiratory and digestive systems
what lives in tonsils
mature lymphocytes
tonsils are different than lymph nodes because they are found close to what
moist epithelial surfaces
where else are tonsils found in the body
larynx, intestine, prepuce and vagina
