A&P - Chapter 10 (Part 1) Flashcards
What type of membrane does the skin have?
Cutaneous
- integument
What are the 2 primary layers of the skin?
- Epidermis
2. Dermis
What is the supporting layer of the skin?
Hypodermis
How much does thin skin cover?
Most of the body
How thick is thin skin?
1-3mm
Where do you find thick skin? (2)
- Soles
2. Palms
How thick is thick skin?
4-5mm
What kind of texture does thin skin have? (2)
- Smooth
2. Has hair
What kind of texture does thick skin have? (2)
- Ridged
2. No hair
Epidermis
Is the outermost and thinnest primary layer of skin
What are the types of cells that compose the epidermis? (4)
- Keratinocytes
- Melanocytes
- Epidermal dendrite cells
- Tactile epithelial cells
What percent of epidermis cells are keratinocytes?
90%
Where are keratinocytes located?
Outer skin
What does keratinocytes do?
They are water proof
- water-proofing
What percent of epidermis cells are melanocytes?
5%
What are 2 functions of melanocytes?
- Pigment producing
2. Filters UV light
What do epidermal dendritic cells play a part of?
The immune response
What do tactile epithelial cells play a part of?
Sensory response
- light touch
What epidermal cells are rich with RNA?
Keratinocytes
Is the most superficial layer of skin alive or dead?
Dead
Why is the outer most layer dead?
You want your first layer of defence to not really matter
What are the epidermis cell layers, from outermost to innermost? (5)
- Stratum corneum
- horny layer - Stratum lucidum
- clear layer - Stratum granulosum
- granular layer - Stratum spinosum
- spiny layer - Stratum basale/germinativum
- base layer
What does the stratum corneum layer consist of?
Dead cells filled with keratin
What is the stratum lucidum layer cells filled with?
Keratin precursor
What do stratum granulosum cells contain?
High levels of lysosomal enzymes
What are stratum spinosum cells rich with?
RNA
What do stratum basale cells undergo?
Mitosis
How many days does it take for the skin cells to reach the surface?
35
Dermoepidermal junction
Is the specialized area between the epidermis and the dermis
What does the dermoepidermal junction act like?
Glue
- holds the 2 layers (epidermis and dermis) together
What does the breakdown of the dermoepidermal junction cause?
Blisters
