DERM: The Skin

Question 1

what are the three layers of skin in order from superficial to the inner layer?

Answer 1

Epidermis
Dermis
Subcutis

Question 2

what are the four layers of the dermis in order from superficial to the inner layer?

Answer 2

stratum corneum
stratum granulouum
stratum spinosum
stratum basale

Question 3

where do you find keritnocytes in the skin?

Answer 3

epidermis

Question 4

which layer of the epidermis is a source of epidermal stem cells?

Answer 4

stratum basale

Question 5

which layer of the epidermis contains melanocytes?

Answer 5

stratum basale

Question 6

Process of cell migration from the stratum basale to the stratum corneum takes how long?

Answer 6

around 30 days

Question 7

Areas of thick skin (palms of hands and soles of feet) contain an additional fifth layer of epidermis - what is this called?

Answer 7

Stratum lucidum: between the stratum granulosum and the stratum corneum, paler, compact keratin.

Question 8

which layer of the skin is mostly collagen?

Answer 8

dermis

Question 9

what are functions of the skin?

Answer 9

• thermoregulation
• fluid balance
• protection
• sensation
• vit D synthesis
• aesthetics

Question 10

what are the 4 phases of wound healing?

Answer 10

1. Haemostasis (vasoconstriction, platelet aggregation, coagulation)
2. Inflammation (vasodilatation, phagocytosis)
3. Proliferation-migration (granulation tissue formation, angiogenesis, re-epithelialisation)
4. Remodelling (collagen, scarring)

Question 11

what is the difference between a macule and a patch?

Answer 11

Macule: small flat lesion.
Patch: larger flat lesion.