Histo- lymphatics Flashcards
Major functions of the lymphatic system:
1) Drain Excess Interstitial Fluid – return to blood stream to help maintain normal blood volume
2) Immune Response – produce, maintain, and distribute lymphocytes
3) Provide an Alternative Transportation Route for Hormones, Nutrients, and Waste Products
what are the different types of lymphocytes:
A) B cells
B) T cells
C) NK (natural killa) cells
Diffuse lymphatic tissue consists of what?
Accumulations of lymphocytes in the lamina propria of the alimentary canal, as well as respiratory, urinary, and reproductive tracts.
-No surrounding capsule
Lymphatic Nodules (a.k.a. Lymphatic Follicles) consist of what?
Accumulations of lymphocytes in the wall of alimentary canal, as well as respiratory, urinary, and reproductive tracts. (just like diffuse lymphatic tissue)
what are primary & secondary lymphatic nodules made of?
Primary- aggregation of primarily small lymphocytes
Secondary- will have a germinal center and a mantle zone
Tonsils, peyer’s patches & the veriform appendix are all examples of _________
lymphatic nodules
what does MALT stand for? BALT? GALT?
MALT: Mucus-Associated Lymphatic Tissue
BALT: Bronchus-Associated Lymphatic tissue
GALT: Gut-associated lymphatic tissue
Lymph nodes are _______ ______ along pathway of lymphatic vessels
Capsuled organs
what are the parts of the Lymph node cortex?
A. superficial (nodular) cortex
B. deep cortex (paracortex)
the superficial (nodular) cortex of the Lymph node contains what?
1) lymphatic nodules (primary & secondary)
2) germinal centers
the medulla of the lymph nodes is made of medullary ______ and _______
medullary cords
medullary sinuses
Cells of Reticular Meshwork in lymph nodes:
1) Reticular cells
2) Dendritic cells (DCs)
3) Macrophages
4) Follicular dendritic cells
________ are extensions between cortex’s of lymph nodes
trebecula
The flow of lymph through the lymph node:
Afferent Lymph Vessel
Subcapsular (Cortical) Sinus
Trabecular Sinus
Medullary Sinus
Efferent Lymph Vessel
The thymus is the site of ____________, where T cells mature
thymic cell education
Function of the Spleen:
Filters and monitors the blood immunologically just as the lymph nodes monitor lymph.
The spleen consists of:
Red & white pulp
the red pulp of the spleen consists of what?
consists of blood-filled venous sinuses (splenic sinuses)
surrounded by cords of splenic tissue called splenic (Billroth’s) cords
the white pulp of the spleen consists of what?
lymphatic tissue consisting mostly of lymphocytes
lymphocytes aggregate around branches of splenic artery (called central arteries)
-creates a periarterial lymphatic sheath (PALS)
red pulp’s primary role is __________
blood filtration
the white pulp carries out what type of functions?
immune functions similar to lymph nodes.
