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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
Q

What are the Secondary Lymphoid Organs

A

Lymph Nodes, Spleen, Mucosa-associated Lymphoid Tissue (MALT)

26
Q

Lymph Node Architecture

A

Outer Cortex, Paracortex, Medulla

27
Q

This structure of lymph node contains round structure called Lymphoid follicles which are composed of B-Cells

A

Outer Cortex

28
Q

This structure of lymph node contains T cells and High Endothelial Venules

A

Paracortex

29
Q

This structure of lymph node is composed of cords and sinuses

30
Q

Lymph Node follicles made up of small, dark, and mature Lymphocytes

A

Primary Unstimulated Follicles

31
Q

Lymph Node Follicle made up of Germinal Center and Mantle Zone

A

Secondary Stimulated Follicles

32
Q

The lymph node capsule and trabeculae consists of what tissue

A

Dense Irregular Connective Tissue

33
Q

This lymphatic vessel penetrates the capsule of lymph node on convex sides and carry lymph from site of infection back to the lymph nodes

A

Afferent Lymphatic Vessels

33
Q

This Lymphatic Vessel leaves through the hilum carry lymph from lymph node and returns it to the blood

A

Efferent Lymphatic Vessels

34
Q

Is the depression in the concave surface of a lymph node

A

Hilum/Hilus

35
Q

How does Lymph flow through the node

A

Afferent Lymphatic > Subscapular Sinus > Intermediate Sinus > Medullary Sinus > Efferent Lymphatics > Larger Lymphatics > Blood

36
Q

Located in Paracortex that allows lymphocytes in blood vessels to adhere to endothelial cells and migrate across vessel wall to the lymphoid tissue

A

High Endothelial Venules

37
Q

Lymphocytes move from blood circulation to lymphatic circulation via ________________

A

High Endothelial Venules

38
Q

How do lymphocytes get from blood to lymph

A

Hilar Arterioles > Arterioles > Capillaries > High-endothelial venules > Lymphocyte enter lymphatic circulation > Efferent Lymph Vessels

39
Q

Functions of Spleen

A

Immunologic Blood Filtration, Proliferation of Lymphocytes, Removal of Old RBC

40
Q

True or False, Spleen has no cortex and medulla

41
Q

The parenchyma of spleen is called __________ and has white and red pulp

A

Splenic Pulp

42
Q

What are the stroma of spleen

A

Capsule, Trabeculae, Reticular Connective Tissue

43
Q

White Pulp of Spleen consists of ____________ and ______________

A

Splenic Follicles and Periateriolar Lymphatic Sheaths

44
Q

These are circular collections of T cells around arterioles in the White Pulp

A

Periarteriolar Lymphatic Sheaths (PALS)

45
Q

These are similar to secondary follicles in lymph nodes but with one more layer (Marginal Zone)

A

Splenic Follicles

46
Q

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

A

Splenic Sinuses (Sinusoids)

47
Q

This red pulp of the spleen is located between the sinuses containing red cells, granulocytes, lymphocytes, macrophages, platelets, and plasma cells

A

Splenic Cords (Cords of Billroth)

48
Q

This are specialized endothelial cells in Splenic Sinuses

A

Stave Cells

49
Q

Meaning of MALT

A

Mucosa Associated Lymphoid Tissue

50
Q

What type of Lymphoid Tissue lines the mucosa and submucosa of Digestive, Respiratory, Reproductive, and Urinary System

A

Mucosa Associated Lymphoid Tissue (MALT)

51
Q

What are the three types of tonsils

A

Pharyngeal, Palatine, Lingual

52
Q

This tonsil is located at the midline of nasopharynx with gentle folds on its surface

A

Pharyngeal Tonsil

53
Q

These are 2 tonsils in lateral Oropharynx lined with Stratified Squamous Epithelium

A

Palatine Tonsils

54
Q

This Tonsil has numerous small tonsils at base of tongue and is lined with stratified squamous epithelium

A

Lingual Tonsil

55
Q

True or False, Each Lingual tonsil is capsulated

A

False, it has no capsule

55
Q

True or False, Pharyngeal Tonsil is lined with stratified columnar epithelium

A

False, Pseudostratified Ciliated Columnar Epithelium

Histology Lecture (Finals) (8 decks)

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