Early development Flashcards
where do the eyes develop?
In the forebrain - in the neural tube and within the neural grooves.
From which day does the eye begin to develop?
Day 17
From which week does the Optic Sulcus begin to develop?
Week 4
Where does the optic sulcus develop from?
the optic sulcus develops from the deep folds in the neural groove.
What develops form the bulge outside of the neural groove?
Optic Cup
from which week does the vesicle lose contact with the ectoderm?
week 5
What properties do crystalline proteins have?
Refraction properties
from which week does the choroid fissure fuse at?
7-8 weeks
what does the Hyaloid artery become?
retinal artery
from which weeks does the optic nerve develop?
6-9 weeks
from which weeks does the retina develop?
7-8 weeks
what does the outer layer of the optic cup develop into?
outer pigment layer of retina
what do 4/5 of inner layer of retina differentiate into?
rods and cones, ganglion and bipolar nerve cells
What is secreted from the ciliary body?
aqueous humour
form which week does the pupil develop?
15 weeks
what are the optic cup and lens supplied by?
Hyaloid artery
what layer of mesenchyme forms sclera?
outer layer
what is the sclera made from?
Tough collagen and corresponds to dura mater of the brain
what happens at 16 weeks of the eye development?
Blood vessels begin to form and choroid gives blood supply
what are the eyelids a development from?
folds of ectoderm and associated mesoderm
at which fetal period do the eyelids close and fuse?
weeks 9-20
what is the master gene for eye development?
PAX6
What can be seen on a low-medium T1 & T2 weighted signal?
Cornea and sclera
what is the optic nerve white matter tract surrounded by?
pia, arachnoid and dura
