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Histology Lecture (Finals) > Lymphatic System - Module 11 > Flashcards

Lymphatic System - Module 11 Flashcards

Lymphatic System

1
Q

This system detects and inactivates foreign substances

A

Lymphatic System/Lymphoid Sy
stem

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2
Q

Formed when interstitial fluid seeps into lymphatic vessels

A

Lymphatic Fluid

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3
Q

Lymph fluid draining the gut which is milky and contains a lot of triglycerides

A

Chyle

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4
Q

The stroma of all lymphoid organs except thymus is composed of what tissue

A

Reticulin Fibers

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5
Q

Stroma of Thymus is composed of what tissue

A

Epithelial Reticular Cells

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6
Q

This is the term for substances that are stainable with silver stains

A

Argyrophylic

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7
Q

Cells of the Lymphoid System

A

B-Lymphocytes, T-Lymphocytes, Natural Killer Cells

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8
Q

Technique used to look for markers (Molecules) on the surface of the cells

A

Flow Cytometry

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9
Q

What are the anti-gen presenting Cells

A

Macrophage, Dendritic Cells

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10
Q

Two types of immunity

A

Cell Immunity and Humoral Immunity

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11
Q

This immunity is acquired when B cells turn into plasma cells that makes anti-bodies that coats and eliminates microorganisms

A

Humoral Immunity

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12
Q

This immunity is acquired when T cells turn to cytotoxic cells and Helper T cells

A

Cellular Immunity

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13
Q

Primary Maturation sites of Lymphocytes

A

Bone Marrow, Thymus, Bursa of Fabricius in avians

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14
Q

Where B lymphocytes arise and mature

A

Bone Marrow

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15
Q

Where T Lymphocytes mature

A

Thymus

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16
Q

Located in the Mediastinum; Lobulated and capsulated structure

A

Thymus

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17
Q

2 Lobules of the Thymus

A

Cortex and Medulla

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18
Q

Term for cells in the Thymus

A

Thymocyte(s) and Thymic Epithelial Reticular Cells

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19
Q

True or False, T cells in medulla are immature

A

False, they’re mature

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20
Q

True or False, T cells in cortex are undergoing various stages of differentiation

A

True

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21
Q

So much T cells are produced, but how much of them dies (in percentage)

A

97%, only 3% lives

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22
Q

Are made up of degenerating epithelial reticular cells and keratin filaments. Unknown Function

A

Hassll’s Corpuscle

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23
Q

True or False, Thymus is heaviest at puberty

24
Q

True or False, The Thymus completely disappears after puberty

A

False, it involutes but never disappears completely

25
What are the Secondary Lymphoid Organs
Lymph Nodes, Spleen, Mucosa-associated Lymphoid Tissue (MALT)
26
Lymph Node Architecture
Outer Cortex, Paracortex, Medulla
27
This structure of lymph node contains round structure called Lymphoid follicles which are composed of B-Cells
Outer Cortex
28
This structure of lymph node contains T cells and High Endothelial Venules
Paracortex
29
This structure of lymph node is composed of cords and sinuses
Medulla
30
Lymph Node follicles made up of small, dark, and mature Lymphocytes
Primary Unstimulated Follicles
31
Lymph Node Follicle made up of Germinal Center and Mantle Zone
Secondary Stimulated Follicles
32
The lymph node capsule and trabeculae consists of what tissue
Dense Irregular Connective Tissue
33
This lymphatic vessel penetrates the capsule of lymph node on convex sides and carry lymph from site of infection back to the lymph nodes
Afferent Lymphatic Vessels
33
This Lymphatic Vessel leaves through the hilum carry lymph from lymph node and returns it to the blood
Efferent Lymphatic Vessels
34
Is the depression in the concave surface of a lymph node
Hilum/Hilus
35
How does Lymph flow through the node
Afferent Lymphatic > Subscapular Sinus > Intermediate Sinus > Medullary Sinus > Efferent Lymphatics > Larger Lymphatics > Blood
36
Located in Paracortex that allows lymphocytes in blood vessels to adhere to endothelial cells and migrate across vessel wall to the lymphoid tissue
High Endothelial Venules
37
Lymphocytes move from blood circulation to lymphatic circulation via ________________
High Endothelial Venules
38
How do lymphocytes get from blood to lymph
Hilar Arterioles > Arterioles > Capillaries > High-endothelial venules > Lymphocyte enter lymphatic circulation > Efferent Lymph Vessels
39
Functions of Spleen
Immunologic Blood Filtration, Proliferation of Lymphocytes, Removal of Old RBC
40
True or False, Spleen has no cortex and medulla
True
41
The parenchyma of spleen is called __________ and has white and red pulp
Splenic Pulp
42
What are the stroma of spleen
Capsule, Trabeculae, Reticular Connective Tissue
43
White Pulp of Spleen consists of ____________ and ______________
Splenic Follicles and Periateriolar Lymphatic Sheaths
44
These are circular collections of T cells around arterioles in the White Pulp
Periarteriolar Lymphatic Sheaths (PALS)
45
These are similar to secondary follicles in lymph nodes but with one more layer (Marginal Zone)
Splenic Follicles
46
This red pulp of the spleen is lined with specialized endothelial cells (Stave Cells) surrounded by rings of reticular fibers in which healthy red cells can easily pass through
Splenic Sinuses (Sinusoids)
47
This red pulp of the spleen is located between the sinuses containing red cells, granulocytes, lymphocytes, macrophages, platelets, and plasma cells
Splenic Cords (Cords of Billroth)
48
This are specialized endothelial cells in Splenic Sinuses
Stave Cells
49
Meaning of MALT
Mucosa Associated Lymphoid Tissue
50
What type of Lymphoid Tissue lines the mucosa and submucosa of Digestive, Respiratory, Reproductive, and Urinary System
Mucosa Associated Lymphoid Tissue (MALT)
51
What are the three types of tonsils
Pharyngeal, Palatine, Lingual
52
This tonsil is located at the midline of nasopharynx with gentle folds on its surface
Pharyngeal Tonsil
53
These are 2 tonsils in lateral Oropharynx lined with Stratified Squamous Epithelium
Palatine Tonsils
54
This Tonsil has numerous small tonsils at base of tongue and is lined with stratified squamous epithelium
Lingual Tonsil
55
True or False, Each Lingual tonsil is capsulated
False, it has no capsule
55
True or False, Pharyngeal Tonsil is lined with stratified columnar epithelium
False, Pseudostratified Ciliated Columnar Epithelium

Histology Lecture (Finals) (8 decks)

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