Embryology Flashcards
1
Q
Lens is formed from the…
A
surface ectoderm
2
Q
Sonic Hedgehog
* inheritance
* variable expression phenotypes
A
- AD
- cylops -> holoprosencephaly -> single front incisor
3
Q
gene that is the master control of the eye
A
PAX6
4
Q
If embryonic fissures do not close leads to ?
A
coloboma
gap in the eye
5
Q
retina originates from the
A
neuroectoderm
6
Q
lens should pinch off at the ? week
A
7th
If doesn’t pinch off -> Peter’s Sequence
7
Q
neuroectoderm forms the vessicle in week ?
A
4
8
Q
pigment around hte lens can be seen in the ? week
A
5th
light perception begins
9
Q
cornea is made from
A
neural crest cells
10
Q
Almost all of the cornea originates from the…
A
neural crest
11
Q
vitreous jelly comes from …
A
all 4 layers
12
Q
If no choroid, also no ?
A
iris
13
Q
Match conditions with their cell origin
* glaucoma
* cataracts
* retinal dystrophies
* retinal vascular disorders
* corneal dystrophies
A
- glaucoma = neural crest
- cataracts = surface ectoderm (makes lens)
- retina = neuroectoderm
- reinal bascular diseases = neural crest
- corneal dystrophies - surface ectoderm or neural crest
