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Histology > Exam 3 – Lecture 21: Hemic-Lymphatic 2 > Flashcards

Exam 3 – Lecture 21: Hemic-Lymphatic 2 Flashcards

1
Q

What are the cells in reticular meshwork of a lymph node?

A

Reticular cells
Dendritic cells
Macrophages
Follicular dendritic cells

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2
Q

What are reticular cells?

A

Collagen III = reticular fibers

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3
Q

What are dendritic cells?

A

Antigen presenters in T areas

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4
Q

What are macrophages?

A

Phagocytes that present antigen

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5
Q

Where are follicular dendritic cells?

A

B areas

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6
Q

What do DCs do with antigen?

A

Pass them onto the lymphoid

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7
Q

What do follicular DCs have?

A

Extensive cytoplasmic processes

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8
Q

What occurs in high endothelial venules?

A

Fluid resorption

Circulating lymphocytes enter exit lymph nodes here

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9
Q

Where is the only place the high endothelial venules exist?

A

Lymph nodes

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10
Q

What kind of organ is the thymus?

A

Lymphoepithelial

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11
Q

Where is the thymus located?

A

Anterior mediastinum/thoracic inlet

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12
Q

What age animals have a thymus?

A

Young

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13
Q

What happens in the thymus?

A

T-lymphocyte development

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14
Q

What are “sweet-breads”?

A

Thymus or pancreas at a butcher shop

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15
Q

What is a thymus made of?

A

Capsule

Trabeculae–––lobules

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16
Q

What cells are found in the thymus?

A

Thymocytes
Epithelioreticular cells (types I-VI)
Macrophages

17
Q

What do thymocytes do?

A

Develop T lymphocytes

18
Q

Where are thymic corpuscles found?

A

In the medulla of the thymus

19
Q

What are thymic corpuscles?

A

Keratinized rings

Epithelial component of the thymus

20
Q

What makes up the blood-thymus barrier?

A

Endothelium
Macrophages
Type I epithelioreticular cells

21
Q

Where is the spleen located?

A

Abdomen, near the stomach

22
Q

What does the spleen look like?

A

Oval, round, or triangular

Mesh-like, so that when smooth muscle contracts a lot of blood can be pushed out of the spleen

23
Q

What does the spleen do?

A

Filters, stores, and removes blood

Antigen processing

24
Q

What makes up the spleen?

A

Fibromuscular capsule and trabeculae
Hilus that attaches to the splenic ligament
Red pulp and white pulp

25
Q

Where does the capsule descend to? What does it become?

A

Down into the spleen and becomes trabeculae

26
Q

What does red pulp of the spleen do?

A

Filtration/degradation

27
Q

What is the red pulp of the spleen like?

A

Rod-shaped endothelium

28
Q

What can be found in red pulp?

A

Macrophages for surveillance

29
Q

Describe white pulp of the spleen

A

Numerous (mostly) lymphocytes
Has a central artery
Has nodules

30
Q

What is the central artery in white pulp?

A

A branch of splenic artery

Histology (30 decks)

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