Shared Flashcard Set

Details

Histology Lab
Lymphoid Tissue
15
Medical
Graduate
10/18/2010

Additional Medical Flashcards

 


 

Cards

Term

Where is this tissue taken from? What are its characteristics? ID the two arrows.

 

[image]

Definition

Lingual Tonsil

Behind the tongue. Contains few lymph nodules with test tube shaped crypts. Has stratified squamous nonkeratinized epithelium.

Skeletal muscle fascicles can be found in three orientations.

 

Left arrow: Lymph Nodule. What is a lymph nodule?

 

Right Arrow: Crypt

 

Lymph nodule is a organized cluster of small lymphocytes with mostly B cells and is surrounded by a corona (mantle). 

Term

Where is this tissue taken from? What are its characteristics? ID the two arrows

 

[image]

Definition

Palatine tonsil

Next to the oropharynx.

Many lymph nodules with long, branched crypts.

Also surrounded by a capsule

 

Top Arrow: Stratified squamous nonkeratinized epithelium

 

Bottom arrow: Lymph nodules with germinating centers

 

 

Term

Where is this tissue taken from? What are its characteristics? ID the arrows.

[image]

Definition

Palatine tonsil

Next to the oropharynx.

Many lymph nodules with long, branched crypts.

Also surrounded by a capsule

 

Two arrows on the left: Lymph nodules with germinating centers. Notice how the corona (mantle or cap) is thickest towards the crypt. 

 

Top right arrow: Capsule

Term

Where is this tissue taken from? What are its characteristics? ID the arrows 

[image]

 

Definition

Pharyngeal tonsil

Contains folds of the mucosa containing many lymph nodules and is covered by pseudostratified ciliated columnar epithelium.

 

Top Left arrow: Lymph Nodule

Bottom right arrow: Pseudostratified ciliated columnar epithelium (NO GOBLET CELLS).

Term

Where is this tissue taken from? ID the arrow and layer. 

 

[image]

Definition

Pharyngeal tonsil

 

Arrow: Epithelial lymphocyte

Layer: pseudostratified ciliated columnar epithelium

Term

Where is this tissue taken from? What is the arrow pointing to?

[image]

Definition

Pharyngeal Tonsil

 

Arrow: Pseudostratified Columnar Epithelium

Term

Where is this tissue taken from? What are the labels?

[image]

Definition

Lymph Nodes

 

A. Capsule and trabeculae - dense irregular CT with reticular connective tissue supporting the lymphoid tissue inside make up the stroma of the lymph node

 

B. Cortex - consists of lymph nodules (primarily B lymphocytes)

 

C1. Postcapillary venules - direct T cells to leave the blood here. (part of the subcortex or paracortex... primarily T cells)

 

E1. Subcapsular sinus (empties in to itermediate or trabecular sinuses)

 

Term

Where is this tissue taken from? What are the labels? 

 

[image]

Definition

Lymph nodes

 

D. Medulla

D1 Medullary cords - consists primary of B cells, plasma cells, and plasma cell precursors.

E2. Medullary sinuses between medullary cords and CT trabeculae. 

Term

Where is this tissue taken from? What are its characteristics? What are the labels?

 

[image]

Definition

Spleen

Very dense and has a thick fibromuscular capsule that is continuous with trabeculae forming the frame work. 

Reticular connective tissue supports the red and white pulp within. 

 

A. Capsule

B. White pulp - has PALS (periarterial sheath) and central artery. the T cells leave the CT trabeculae  and surround the arteries. PALS is surrounded by B cells. 

 

B1. Central Artery

 

D. Red pulp - consists of venous sinuses surrounded by a loose meshwork of reticular CT and macrophages through which the blood percolates. Macrophages remove the old RBCs.

 

What are RBCs broken down to? What happens to them?

 

Heme + globin + iron

Globin is broken down into amino acids

Heme is transferred into bilirubin and secreted as bile

Iron is returned to the marrow via transferrin

Term

Where is this tissue taken from? What are the labels?

 

[image]

Definition

Spleen

 

B. White pulp

 

C. Marginal zone (mostly macrophages that are interposed between the white and red pulp)

 

D. Red pulp - venous sinuses, loose reticular CT, and macrophages.

 

White pulp is not be confused with lymph nodes. White pulp stains dark, while the central artery can make it look white.

Term

Where is this tissue taken from? What are the labels?

 

[image]

Definition

Spleen

 

A. Venous sinuses

A1. Tangential cut of the sinus with circular reticular fibers. 

Term

Where is this tissue taken from? What is the region?

 

[image]

Definition

Spleen

 

Lymph Nodule

Notice how the reticular fibers are not in the region and is surrounding the nodule. 

Term

Where is this tissue taken from?What are its characteristics? What are the labels?

 

[image]

Definition

Thymus

Lightly stained medulla (because the cells are larger and the nuclei are spread out)

Darkly stained cortex

Notice the many lobules and how dense the staining is due to the high number of lymphocytes.

 

A. **Thin CT from the capsule that form partitions that subdivide the cortex in the medulla. Each lobule contains cortex and medulla. 

 

 

Term

Where is this tissue taken from? What is the label pointing to?

 

[image]

Definition

Thymus

 

Thymic or Hassals corpuscles in the medullary region**

 

They develop from the third pharyngeal pouch**

 

What type of cell is Hassals corpuscles? Type VI. (Medulla has types IV, V, and VI and the cortex has types I, II, and III.)

 

Is the thymus a primary or secondary lymph organ? Primary, it is responsible for the development and maturation of lymphocytes (also includes fetal liver and pre/post natal bone marrow). Secondary lymph organs are lymph nodes, spleen, MALT (GALT,BALT), and post natal bone marrow. 

 

What is the chief role of the thymus?

T cell maturation. 

Term

Where is this tissue taken from? ID red and white pulp, venous sinuses, central artery, capsule, and CT trabeculae. 

 

[image]

 

[image]

Definition
Supporting users have an ad free experience!