Histology Lecture (Epithelial Cells) part 2 Flashcards
4 types of specialized cell surfaces.
- Microvilli
- Stereocilia
- Cilia
- Flagella
2 Types of shape of Microvilli.
- Brushed
- Striated
Microvilli: Striated - where can it be found?
Gastro Intestinal Tract (GIT)
Microvilli: Brushed- where can it be found?
Proximal Convulated Tubules, Kidney
Short or long fingerlike extensions or folds.
Microvilli
Vertical striations seen in refractile border of columnar epithelium.
Microvilli
Microvilli’s brush borders serves us?
Serve as adaptation to enhance
the surface area of membrane exposed to
substances to be absorbed
Longer than microvilli.
Stereocilia
Motor detecting
Stereocilia
Long non-motile processes of cells projecting in the lumen from each cell in the epithelium of epididymis.
Stereocilia
Like hair of a water color brush
Stereocilia
Longer branched microvilli
Stereocilia
Its function is not well established but in the epithelium, it is absorptive.
Stereocilia
Assumed that it promotes its function by
amplifying the cell surface
Stereocilia
Where can stereocilia can be found?
- Inner ear
- Epididymis
- Male reproductive tract
- Part of ductus deferens
Numerous motile processes larger than
microvilli.
Cilia
Arranged in parallel rows projecting from surfaces of some epithelial cells.
Cilia
At the base of cilia is dense elongated granule called?
Basal Body
Moves in waves and sweep over epithelium.
Cilia
Surfaces serve to propel fluid or coating of mucus towards the exterior.
Cilia
Elongated motile structure on surface of epithelial cells, longer than cilia.
Flagella
How does flagella differ from cilia?
They differ in movements and the number of cells.
What is the largest flagella?
Mammalian Spermatozoa
Where can flagella be found?
- Epithelia of Nephrons
- Testes
- Ducts of glands
Varied in shape, from high columnar to
cuboidal to low squamous cells including all intermediate forms.
Epithelial Cells
What is the form of epithelial cells? Why is it like that?
- Polyhedral form
- This is due to their position in cellular layers
What is the shape of the nuclei of epithelial cells.
- spherical or elongated.
- They correspond to the shape of the cell.
In cuboidal cell, what is the shape of the nuclei?
spherical
In squamous cell, what is the shape of the nuclei?
flat
Long axis of the nucleus is always __________ to the main axis of the cell.
parallel
Classification of Epithelial Tissue in accordance to complexity or number of layers.
- simple
- stratified
- pseudostratified
- transitional
Classification of Epithelial Tissue in accordance to shape
- squamous
- cuboidal
- columnar
Types of simple epithelial cells
- simple squamous epithelium
- simple cuboidal epithelium
- simple columnar ciliated epithelium
- simple columnar non-ciliated epithelium
- pseudostratified columnar ciliated epithelium
- pseudostratified columnar stereociliated epithelium
Types of stratified epithelial cells
- stratified squamous keratinized epithelium
- stratified squamous non-keratinized epithelium
- stratified cuboidal epithelium
- stratified columnar epithelium
- transitional epithelium
- glandular or pyramidal epithelium
