L50 Histo Lymphatic

Question 1

Compenents of lymphatic system (7)

Answer 1

Diffuse lymphatic tissue
Lymphatic nodules
Lymphatic nodes
Lymphatic vessels
Bone marrow
Spleen
Thymus

Question 2

Lymphatic functions

Answer 2

drain excess interstitial fluid
Transport for hormones, nutrients, waste
Immune response

Question 3

Diameter of lymphatic vessels

Answer 3

Larger to root of neck

Question 4

Lymphatic duct sides

Answer 4

Right lymphatic duct: 1/4

Thoracic duct: 3/4

Question 5

Endothelial cells in lymphatic tissue

Answer 5

Stain darker because of proteins in lymph

Question 6

Lymphatic tissue histo

Answer 6

Thin walls
Large lumen
No RBC

Question 7

B cells
Function
Type of immunity
Percent

Answer 7

Produce antibodies
Humoral immunity
20-30%

Question 8

T cells
Function
Type of immunity
Percent

Answer 8

Attach and destroy cells
Cell mediated immunity
60-80%

Question 9

Natural Killer cells
Function
Percent

Answer 9

Kill certain transformed cells

5-10%

Question 10

Diffuse lymphatic tissue
What is it
Location
Capsule?

Answer 10

Accumulation of lymphocytes in lamina propria of alimentary canal, respiratory, urinary, reproductive tracts
No capsule

Question 11

Lymphatic nodule
What is it
Location
Histo

Answer 11

Accumlation of lymphocytes in alimentary canal, respiratory, urinary, reproductive tracts
No capsule
Sharply defined

Question 12

Secondary nodule contains

Answer 12

germinal center
mantle zone
Follicular dendritic cells

Question 13

Aggregated lymphatic nodules found in (3)

Answer 13

Tonils
Ileum (peyer’s patches)
Appendix

Question 14

MALT
GALT
BALT

Answer 14

Mucus associated lymphatic

• Gut: alimentary tract
• Bronchus: respiratory system

Question 15

Lymph node: deep vs superficial cortex

Answer 15

Superficial: primary or secondary lymphatic nodules
Deep: no nodules, lets of T lymphocytes

Question 16

Lymph node medulla

composed of

Answer 16

Medullary cords: groups of cells

Medullary sinuses: drainage of lymph

Question 17

Cells of reticular meshwork

Answer 17

Reticular cells
Dendritic cells: APC
Macrophages: phago, APC
Follicular dendritic cells

Question 18

Efferent vs afferent lymphatic vessel

Answer 18

Afferent comes in at any point along capsule

Efferent is at hilum

Question 19

Lymph flow in node

Answer 19

Capsule
Subcapsular sinus
Trabecula
Trabecular sinus
Medullary sinus
Efferent at hilum

Question 20

Types of cells in
Nodular cortex
Deep cortex
Medulla

Answer 20

B cells
T cells
B cells

Question 21

Most lymphocytes enter node thru

Answer 21

Thru high endothelial venules

Question 22

Thymus

Cell maturation

Answer 22

Cortex has immature T cells

Medulla is where education takes place and holds mature T cells

Question 23

Key sign of Thymus Histo

Answer 23

Hassall’s Corpuscle (small pink circle inside light medulla)

Question 24

Hassall’s corpuscle is type __ epithelioreticular cell

Answer 24

Type 6

Question 25

Red pulp

Composition

Answer 25

Blood filled venous sinueses surrounded by billroths cords

Question 26

Billroth’s cords contain

Answer 26

red blood cells
Macrophages
lymphocytes
plasma cells
granulocytes

Question 27

Billroths cord function

Answer 27

Bood filtration

Question 28

White pulp

Composition

Answer 28

Lymphocytes agreggating around central arteries–>Periarterial lymphatic sheaths

Question 29

White pulp

function

Answer 29

immune functions similar to lymph nodes

Question 30

Red pulp vs white pulp staining

Answer 30

Red is lighter and white is darker

White pulp w/ germinal center has artery pushed to the side