Epidermis Flashcards
About 90% of epidermal cells are
Keratinocytes
Epidermis is composed of
Keratinized stratified squamous epithelium
Keratinocytes
Are the predominant cell in the epidermis.
Keratin
A tough fibrous protein that helps protect the skin and underlying tissues from abrasions, heat, microbes and chemicals
How many strata or layers in most regions of the body
4
The epidermis has four strata or layers called
Thin skin
Where exposure to friction is greatest the epidermis has
Five layers
When the epidermis has five layers called
Thick skin
Layers of thick skin from superficial to deepest
(Come Let’s Get Sun Burn). (thick) stratum Corneum, stratum Lucidum, stratum Granulosum, stratum Spinosum, stratum Basale.
Stratum Lucidum is present in
Thick skin
Which layer consist on average of 25 to 30 layers of flattened dead keratinocytes?
Stratum Corneum
Keratinization
When cells move from one epidermal layer to the next they accumulate more and more keratin.
In four to six weeks or about a month the cells form
Stratum Basale, rise to the surface, become keratinized and slough off.