Embryology Flashcards
1
Q
Where does the epidermis derive from?
A
Ectoderm
2
Q
Where does the dermis derive from?
A
Mesoderm
3
Q
Where do melanocytes derive from?
A
Neural crest
4
Q
What skin structures are present at 4 weeks of development?
A
Periderm
Basal layer
Corium (Dermis)
5
Q
What skin structures are present at 16 weeks of development?
A
All normal layer
But no skin appendages
6
Q
What skin structures are present at 26 weeks of development?
A
Normally developed skin
7
Q
At what time do melanocytes migrate from the neural crest?
A
~16 weeks
8
Q
What pattern does skin growth follow?
A
Blaschko’s lines
9
Q
How does a hair form embryologically?
A
A hair bud forms down from the epidermis
A hair papilla forms with the hair shaft upwards
The other parts of a pilo-sebaceous unit form as well as a blood supply
