Devt Of The Eye

Question 1

Optic vesicles come from which structure

Answer 1

Optic placode (grooves)

Question 2

What structure is formed when the OPTIC VESICLES come in contact with SURFACE ECTODERM?

Answer 2

LENS PLACODE

Question 3

The invagination of Lens Placodes forms which structure?

Answer 3

Lens Vesicle

Question 4

Lens Vesicle is formed at what week?

Answer 4

Week 5

Question 5

T/F

Lens vesicle detaches from ectoderm and lies in mouth of optic cup during the 8th week?

Answer 5

F. Former is true. Week is false. 5th week dapat.

Question 6

Cells of posterior wall elongate and form the primary lens fibers that reach anterior wall

This happens during what week?

Answer 6

5th week

Question 7

At which week are the secondary lens fibers added to the central core?

Answer 7

5th

Question 8

The invagination of the optic vesicles forms which structure?

Answer 8

Optic cup

Question 9

What neurovascular structure is at the back of the optic cup?

What structure does the mouth of the optic cup turn into?

Answer 9

Optic nerve

Pupil

Question 10

Structure that allows the Hyaloid Artery to enter the eye

Answer 10

Choroid Fissure

Question 11

At what week do the lips of the choroid fissure fuse

Answer 11

7th

Question 12

Defect wherein the choroid fissure failed to close?

Answer 12

Coloboma

Question 13

Layers of the Retina

Answer 13

Inner Neural Layer

Outer Pigmented Layer

Question 14

Inner Layer has an anterior and posterior portion. What are they?

Answer 14

Para Optica Retinae (Posterior 4/5)

Pars Ceca Retinae (Anterior 1/5)

Question 15

Pars Ceca Retinae is again divided into 2 layers

Answer 15

Pars Iridica Retinae

Pars Ciliaris Retinae

Question 16

Pars Iridica Retinae form

Answer 16

Inner layer of iris

Question 17

Pars Ciliaris Retinae

Answer 17

Forms ciliary body

Question 18

Layers of Pars Optica Retinae

Answer 18

Layer of rods and cones
Outer and Inner Nuclear Layer
Ganglion Cell Layer
Fibrous layer -contains cells that form the Optic Nerve

Question 19

Layer of pars ceca retinae that is connected to lens by network of elastic fibers, the suspensory ligament

Answer 19

Pars Ciliaris Retinae

Question 20

The sclera and choroid come from

Answer 20

Loose mesenchyme surrounding eye premordium

Question 21

Highly vascularized pigmented inner layer

Answer 21

Choroid

Question 22

Fibrous coat continuos with dura around optic nerve

Answer 22

Sclera

Question 23

Formed from “vacuolization” of mesenchyme in front of eye

Answer 23

Inner layer in front of lens and iris —> Iridopupillary membrane

Outer layer continuous with sclera —> substancia propria of the cornea

Question 24

Disappears completely providing communication between ant and posterior eye chambers

Answer 24

Iridopupillary membrane

Question 25

Cornea is formed by

Answer 25

A. Ectoderm derived epithelial layer B. Substancia propria (Stroma) C. Epithelial layer that borders the anterior chamber

Question 26

Structure that becomes the optic nerve at 7th week

Answer 26

Optic stalk at 7th week

Question 27

Defect because of failure of resorption during formation of ant. chamber

Answer 27

Iridopupillary membrane persistence

Question 28

Absence of one eye

Answer 28

Anopthalmia

Question 29

Lens becomes opaque during intrauterine life

Answer 29

Congenital Cataract

Question 30

Cause of cong. cataract

Answer 30

German Measle attach 4-7 weeks

Question 31

Causes of Micropthalmia (eye is too small; eye ball 2/3 of normal volume

Answer 31

Cytomegalovirus Taxoplasmosis

Question 32

Eyes are fused because of loss of midline structures

Answer 32

Synopthalmia

Question 33

Choroid Mater

Answer 33

Pia/Arachnoid

Question 34

Sclera

Answer 34

Dura mater