HISTO LABORATORY Flashcards
They consists of a layer or collection of cells having similar type that are found lining an external or internal surface
Epithelium
The cytoplasm is either very scanty or almost absent that only the protruding nucleus and the thin cell membranes are visible.
Simple Squamous Epithelium
Example of Simple Squamous Epithelium
Epithelium of Bowman’s Capsule/
Loop of Henle
In surface view, the cells are polygonal but they appear spindle-shaped and flattened when cut perpendicular to the free surface or basal border.
Simple Squamous Epithelium
This consists of a single layer of extremely thin cells with barely visible cytoplasm.
Simple Squamous Epithelium
This type of epithelium consists of a single layer of cells which appear as squares in the lateral or side view and on surface view; they appear as squares or hexagons.
Simple Cuboidal Epithelium
Example of Simple Cuboidal Epth.
striated duct of the sublingual or parotid gland,
follicle of the thyroid gland
and the collecting tubule of the kidney
How would you define the nucleus of a simple cuboidal?
The nuclei are located centrally or paracentrally.
The cells rest on the basal lamina.
The lateral cell borders may or may not be clearly identifiable.
This type of epithelium is composed of a single layer of tall but narrow or slim cells.
Simple Columnar Epithelium
The cells are polygonal or hexagonal in shape on surface view with elongated nuclei which are situated toward the basal border
Simple Columnar Epithelium
Examples of Simple Columnar Epithelium
A.) The luminal surface of the fallopian tube showing ciliated simple columnar epithelium
B.) section of the duodenum, cecum, colon, rectum or ileum (luminal surface) showing the epithelial type with goblet cells.
The intestine has a brush border which are called?
The simple columnar epithelium in the intestines has a brush border which are actually microvilli.
In this epithelium, usually, the nuclei form a distinct row or they may form two rows when cells are crowded.
Simple Columnar Epithelium
This is a simple columnar epithelium, which seemingly appears stratified due to the presence of a single layer of cells.
The cells rest on the basal lamina but not all of them reach the free surface.
Pseudostratified Columnar Epithelium
Shapes of cell in Pseudostratified columnar epithelim?
Those that reach the free surface are columnar and those that do not reach the free surface are cuboidal or fusiform.
The nuclei appears to be crowded and they are seen in several layer;
the topmost layer are nuclei of the columnar cells;
the middle layer to the fusiform cells and the lowest layer to the cuboidal cells.
Pseudostratified Columnar Epithelium
This type of epithelium is generally ciliated and they also contain goblet cells as in the lining epithelium of the respiratory tract.
Pseudostratified Columnar Epithelium
Examples of Pseudostratified Columnar Epithelium
Trachea
Epididymis
The cilia in epididymis are called?
Stereocilia
What are stereocilia and their function?
- are nonmotile, and aid in increasing the absorptive or secretory area.
The cilia in the respiratory tract are motile and are classified
Kinocilia
This epithelium is made up of 2 or more cell layer; the top most layer are squamous cells.
The epithelium may be keratinized which is generally thicker or it may be non-keratinized.
Stratified Squamous Epithelium
The basal layer of cells, which are usually cuboidal or columnar in shape all, rest on the basal lamina and they are extremely basophilic due to the extensive RER.
Stratified Squamous Epithelium
Example of Stratified Squamous Keratinized Epithelium
eyelid, skin, soles of footpad, and lip.
Example of Stratified Squamous Non- Keratinized Epithelium
esophagus (dog and cat)
the cornea of the eye,
vagina
inner surface of the eyelid
This epithelium is made up of 2 or more layers of cells. The basal layer is made up of cuboidal cells that rest on a basal lamina.
Stratified Columnar Epithelium
If a three layered epithelium is present, the intermediate layer is usually polygonal while the apical or surface layer is made up of columnar cells.
Stratified Columnar Epithelium
Is seen lining the large excretory ducts of the parotid, submaxillary or sublingual gland.
Stratified Columnar Epithelium
this type of epithelium is classified as stratified type of epithelium. It has been termed transitional because of the cell’s ability to change shape as a result of the pressure applied on it from the luminal surface.
Transitional Epithelium
Transitional epithelium is associated mainly with the urogenital system thus it is referred to as the ___
urothelium
Transitional epithelium in relaxed state morphology
The cells consist around 6-7 layers in a relaxed state.
The basal layer is made up of very small polyhedral cells that rest on a basal lamina.
The intermediate layer of cells are polyhedral or pearshaped.
The cells at the luminal or surface layer are balloon-shaped.
Transitional epithelium in stretched state morphology
The layers of the epithelium are reduced to 2-3 layers in a distended or expanded state and the surface layer appears like squamous cells.
This type of epithelium is seen in the urinary bladder and the ureter.
Transitional epithelium
are specialized cells that function for absorption, protection, secretion and excretion, and formation of barriers for selective permeability.
Epithelial cells
are classified based on the shape of the cells and the number of layers of cells present.
epithelial cells
