Eye - Embryology Flashcards
Where does the eye develop from?
Neural tube
Neuroectodermal in origin
What end of the neural tube forms the brain?
The head end
Where do the optic vesicles grow outwards from?
Diencephalic part of neural tube towards surface of ectoderm
What line is pointing to the optic vesicle?
The bottom
2 optic vesicles on either side
Name structures A and B
A = optic vesicles
B = forebrain
What happens when optic vesicles reach the surface of the ectoderm?
Cells thicken and form the lens placode
What does the lens placode do?
It starts to push inwards which causes the optic vesicles to form an optic cup
2 layered cup
A = optic cup
B = lens vesicle
What eventually happens to the lens vesicle?
Looses its connection with the surface ectoderm
What fissure is formed as the optic cup forms?
Choroid fissure
Formed by blood vessels passing through the wall
What does the surface ectoderm form?
Eyelids, conjunctiva, corneal epithelium
What does the mesenchyme form?
Choroid, stroma of cornea, sclera and extracular muscles
Where do the lens fibres form?
The epithelium of the lens vesicles and later loose their nuclei
Name A and B
A = surface ectoderm
B = mesenchyme
