Embryology Flashcards
1
Q
where does the epidermis come from?
A
ectoderm (periderm)
2
Q
where does the dermis come from?
A
mesoderm
3
Q
foetal skin development
A
- 4 weeks: periderm, basal layer and dermis
- 16 weeks: keratin layer, granular layer, prickle cell layer, basal layer and dermis. Also, melanocytes migrate from the neural crest to epidermis.
- 26 weeks: skin is formed with hair follicles, arrector pili muscles, glands, etc.
4
Q
define Blaschko’s lines
A
developmental pattern of skin, not following vessels, nerves or lymphatics
