Skin Flashcards
1
Q
2 layers of skin and 3rd (false) layer
A
- epidermis - stratified squam.
- dermis - dense irreg. CT
- hypoderm. - loose CT with adipose
2
Q
2 types of skin
A
- thick - thick epi, no hair, palms and soles
2. thin - everywhere else
3
Q
5 layers of epidermis
A
- stratum basale
- stratum spinosum
- Stratum granulosum
- Stratum lucidum
- Stratum corneum
4
Q
Feat. of basale
A
- at basement membrane
- anchored by hemidesmosomes
- layer of proliferation
5
Q
Feat. of spinosum
A
- many desmosome connections
- begin to dev. squamous shape
6
Q
Feat. of granulosum
A
- cells have squamous shape
- fill with keratohyaline and lammelar granules
- mix to start forming keratin
- creates water barrier and superior cells are cut off from diffusion
7
Q
feat of lucidum
A
- inconsistent band
8
Q
feat. of corneum
A
- layer of dead, keratin filled cells
9
Q
4 cell types of epidermis
A
- keratinocytes
- melanocytes
- langerhans
- merkle
10
Q
feat of keratinocytes
A
- most numerous
- accumulate keratin and melanin
- synthesize vit D precursor
11
Q
feat of melanocytes
A
- occupy basal layer
- 5-10% of cells
- synthesize menanin to go to keratinocytes
12
Q
feat of langerhans
A
- 5% of cells pop
- antigen presenting
13
Q
feat of merkle cells
A
- located in stratum basale
- play role in mechoreception
14
Q
2 layers of dermis
A
- papillary - loose connective tissue
2. reticular - denser connective tissue
15
Q
feat of papillary layer
A
- dermal ridges and papillae increase contact
- blood supply to nourish epidermis
