Flashcards in Chapter 28: Lymphatic System Deck (49)
what is M.A.L.T
(Mucosa associated lymphoid tissue)
Digestive lymph nodules
where are tonsils positioned and what do they do?
-Positioned around the pharanx
-Remove pathogens that enter via air or food
what are the three types of tonsils? describe
1.) Pharyngeal tonsil
-one nodule in nasophranx
2.) Palatine tonsils
-two nodules on the soft palate
3.) Lingual tonsils
-two nodules at the base of the tongue
what MALT lines mucosa of the small intestine
Aggregated lymphoid nodules
what is the appendix?
Blind tube at the beginning of small intestine
Area prone to infection
-Intestinal flora enter underlying tissues
lymphatic organs are surrounded by.....
a fibrous, connective tissue capsule
what are the three lymphatic organs?
describe lymph nodes (3)
-Between several afferent and one efferent vessel
(indented region where BV’s, nerves, and efferent lymph vessels connect)
lymph nodes have a cortex and medulla.. describe both sections
-capsule has trabeculae that subdivide it
Has two regions:
(consists of aggregated B-cells)
(T cells enter blood here)
B-cells leave through the efferent vessel
what are the 6 locations of lymph nodes?
Where is the spleen located?
the left side of the stomach
True or False: the spleen is the largest lymphatic organ
the spleen is made up of 2 types of pulp... what are they and describe them
-resembles lymph node
-large amounts of RBC
-sinuses, macrophages, T/B cells
what are the functions of the spleen? (5)
Remove old RBC’s
Initiate immune response
RBC production in fetus
where is the thymus located?
describe the size and development of the thymus over time as you age
first lymph organ to develop
grows until puberty
Shrinks with age
replaced by fibrous & adipose tissue
the thymus has 2 lobes with lobules. what are they?
Cortex-mostly immature T-cells
Medulla-mostly reticular epithelial cells
describe the T cells in the thymus
Cortex produces T-cells
Mature and migrate into medulla
Enter blood vessels and go into circulation