Embryology of the eye

Question 1

What organ is the eye an extension of?

Answer 1

the brain

Question 2

What structure does the brain develop from embryologically?

Answer 2

the neural tube

Question 3

What do we say the eye is in origin?

Answer 3

neuroectodermal

Question 4

Where do optic vesicles grow from?

Answer 4

diencephalon vesicles of neural tube

Question 5

What happens to the optic vesicles?

Answer 5

reach surface ectoderm and cause it to thicken

Question 6

What Is this induced thickening of the ectoderm called?

Answer 6

placode - lens placode

Question 7

How is the optic cup formed?

Answer 7

lens placode invaginates and optic vesicles form an optic cup

Question 8

what do the 2 layered optic cup go on to form?

Answer 8

layers of the retina

Question 9

What is the passage called where blood vessels pass to the optic cup?

Answer 9

choroid fissure

Question 10

What layers of the optic cup form what layers of the retina?

Answer 10

outer layer - 1 layer

inner layer - 9 layers

Question 11

Surface ectoderm goes on to form

Answer 11

–> eyelids, conjunctiva, corneal epithelium

Question 12

mesenchyme goes on to form

Answer 12

choroid, stroma of cornea, sclera and extraocular muscles

Question 13

What happens to the epithelium of the lens vesicle to form the lens fibres?

Answer 13

detach and lose their nuclei to become transparent

Question 14

What 2 things forms the mesenchyme?

Answer 14

neural tube and mesoderm