Lymphatics Flashcards
What is unique about circulation of the lymphatic system?
Closed with no pump
What is lymph?
Interstitial fluid and protein (Lymphocytes) with a small amount of RBCs
How is lymph prevented from flowing back into lymphatic capillaries?
Luminal valves
What are the two primary lymphoid organs?
Thyroid, Bursa of Fabricius
What are secondary lymphoid organs/tissues?
Lymph nodes, tonsils, spleen, MALT, GALT
What are the three main functions of the lymphatic system?
Fluid recovery (Preventing edema), lipid absorption, WBC transport
Where does lymph picked up on the RIGHT side of the body drain?
Right lymphatic duct, right subclavian vein and then back into circulation
Where does lymph picked up on the LEFT side of the body drain?
Thoracic duct, left subclavian vein and then back into circulation
How is lymph moved throughout the body?
Breathing, skeletal muscle contraction, smooth muscle contraction in lymphatic vessel walls
Name the six locations of lymph nodes on a dog.
Parotid, submandibular, prescapular, axial, inguinal, and popliteal
What type of cell is produced in the thyroid gland?
T lymphocytes (T cells)
What are the cells of the thymus called?
Thymocytes
T-cells mature as they move from which part of the thymus to which other part of the thymus?
Mature as they move from the cortex to the medulla
What do thymus-epithelial reticular cells do?
Aid in maturation of T cells and produce cytokines
Where are Hassall’s corpuscles found?
In the medulla of the the thymus gland
What is produced in the Bursa of Fabricius?
B cell precursors and immature B cells
What are GALT, BALT, MALT, and NALT?
Lymphoid tissue associated with the gut, bronchus, mucosal tissue, and nasal tissue, all secondary lymphoid tissues
Where in the lymph node are lymphocytes kept?
B cells: Germinal centers of follicles
T cells: Paracortical zone (Outside follicle)
How are lymph nodes supplied with blood?
Arterioles that enter at the hilus, high endothelial vessels
What is special about a pig’s lymph nodes?
The cortex and medulla are inverted
What aquatic bird species have lymph nodes?
Ducks, geese
What are the components of splenic white pulp?
Germinal center (With B cells), lymphoid follicle, periarteriolar lymphoid sheath (With T cells), mantle zone, perifollicular/perilymphoid red pulp
What are the components of splenic red pulp?
Splenic sinuses, splenic cords, and reticulin fibers
If Peyer’s patches are seen, what section of the intestines is being looked at?
The ileum
What blind-ended tubular sac also contains lymphoid follicles similar to the ileum?
The appendix, contains mostly B cells but some T cells
