Term
Where is this tissue taken from? What are its characteristics? ID the two arrows.
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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). |
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Term
Where is this tissue taken from? What are its characteristics? ID the two arrows
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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
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Term
Where is this tissue taken from? What are its characteristics? ID the arrows.
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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 |
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Term
Where is this tissue taken from? What are its characteristics? ID the arrows
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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). |
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Term
Where is this tissue taken from? ID the arrow and layer.
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Definition
Pharyngeal tonsil
Arrow: Epithelial lymphocyte
Layer: pseudostratified ciliated columnar epithelium |
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Term
Where is this tissue taken from? What is the arrow pointing to?
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Definition
Pharyngeal Tonsil
Arrow: Pseudostratified Columnar Epithelium |
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Term
Where is this tissue taken from? What are the labels?
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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)
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Term
Where is this tissue taken from? What are the labels?
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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. |
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Term
Where is this tissue taken from? What are its characteristics? What are the labels?
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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 |
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Term
Where is this tissue taken from? What are the labels?
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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. |
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Term
Where is this tissue taken from? What are the labels?
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Definition
Spleen
A. Venous sinuses
A1. Tangential cut of the sinus with circular reticular fibers. |
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Term
Where is this tissue taken from? What is the region?
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Definition
Spleen
Lymph Nodule
Notice how the reticular fibers are not in the region and is surrounding the nodule. |
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Term
Where is this tissue taken from?What are its characteristics? What are the labels?
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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.
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Term
Where is this tissue taken from? What is the label pointing to?
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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. |
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Term
Where is this tissue taken from? ID red and white pulp, venous sinuses, central artery, capsule, and CT trabeculae.
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Definition
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