Skin Physiology

Question 1

Briefly describe the epidermis and dermis

Answer 1

Epidermis:

• Avascular (mostly keratinocytes)
• Forms appendages (hair, nails, glands)

Dermis:

• Vascular
• NErves and muscles

Question 2

Describe skin regeneration in epidermis and dermis.

Answer 2

Epidermis is easy to regenerate. Epidermal stem cells.

Dermis is hard to regenerate. Vascularity means it has an immune response, harder to heal.

Question 3

Descrone the 3 wound repair stages

Answer 3

1. Inflammation
2. New tissue formation (scab forms, angiogenic)
3. Remodelling (disorganised collagen, absence of normal appendages)

Question 4

Describe the 3 burn degrees.

Answer 4

First degree - only epidermis
Second degree - involves part of dermis
Third degree = involves all of dermis and often deeper tissues.