lab 9 lymph Flashcards
Clustered lymphatic nodules composing a Peyer’s patch are present in the lamina propria and/or submucosa at one side of the ___ .
Ileum
Germinal centers
some nodules have central pale areas due to the presence of lymphocytes with paler nuclei and larger amounts of cytoplasm.
The rim of small lymphocytes surrounding the germinal center is called the ___ or ___ of the nodule.
corona
marginal zone
Nodules in the Peyer’s patch are partly encapsulated by ___
ense irregular connective tissue.
Tonsils lie deep to the ____ that lines the oral cavity and pharynx.
stratified squamous epithelium
The surface over the tonsil may be smooth or it may form deep invaginations called ____
crypts
horse have crypts, carnivore do not
___ have crypts, carnivore do not
horse
___ are collections of nodules and diffuse lymphatic tissue in the sub-epithelial connective tissue.
tonsils
The entire tonsil of a dog, lies within a fossa, and is covered in part by a ____
semilunar fold
____ are extensions of the dense connective tissue of the capsule that dip into the interior
trabeculae
B cell areas
nodules
T cell areas
deep cortical lymphatic tissue
paracortex
densely cellular extensions of cortical tissue
medullary cords
Medullary ___ are crossed by many fine strands of pink cytoplasm representing the branches of reticular cells - the fibroblastic cells that form the meshwork in most lymphatic tissue.
sinuses
Macrophages often contain ____, a golden-brown pigment resulting from the breakdown of red blood cells.
hemosiderin
____ are peculiar lymphatic organs found in some species, especially in ruminants.
hemal nodes
Hemal nodes are similar in architecture to lymph nodes but are supplied with___
blood vessels
hemal nodes
ruminants.
similar to lymph nodes
supplied with blood vessels and lack lymphatic vessels.
encapsulated and have a subcapsular sinus.
Nodular and diffuse lymphatic tissue is surrounded by blood-filled communicating sinuses in a meshwork of cells that are probably smooth muscle cells.
In the spleen, ____ is blue/purple because it is composed of lymphocytes that take up hematoxylin
White pulp
in the spleen, Trabecular ___ have a distinct wall, whereas trabecular ___ are endothelial-line tunnels within the trabecular substance.
arteries
veins
In the horse, cat and dog, the capsule and trabeculae are largely composed of ___ cells which can relax and allow the spleen to fill with blood and contract and expel the stored blood back into the circulation.
smooth muscle
white pulp in the spleen is oriented around ___
central arteries
PALS
periarterial lymphatic sheaths
PALS is found where and what is inside
around the central arteries of the white pulp of the spleen
T cells and DC cells