Embryology

Question 1

which 2 layers foes the eye develop from?

Answer 1

ectoderm and mesoderm

Question 2

Ciliary body epitheilium derived from?

Answer 2

Neuroectoderm

Question 3

Iris epitheliumderived from?

Answer 3

Neuroectoderm

Question 4

Iris sphincter and dilator muscles derived from?

Answer 4

Neuroectoderm

Question 5

Optic nerve axons and glia derived from?

Answer 5

Neuroectoderm

Question 6

RPE derived from ?

Answer 6

Neuroectoderm

Question 7

Vitreous derived from?

Answer 7

Neuroectoderm, nerual crest cells and mesoderm

Question 8

Orbital bones derived from?

Answer 8

Neural crest cells

Question 9

Orbital cartilage dervied from?

Answer 9

Neural crest cells

Question 10

Choroid/iris stroma derived from?

Answer 10

Neural crest cells and mesoderm

Question 11

Ciliary ganglion

Answer 11

Neural crest cells

Question 12

Connective tisseu derived from?

Answer 12

Neural crest cells

Question 13

Corenal stroma and endothelium derived from?

Answer 13

Neural crest cells

Question 14

EOM sheats and tendons derived from?

Answer 14

Neural crest cells

Question 15

Orbital fat dervied from?

Answer 15

Neural crest cells & Mesoderm

Question 16

Melanocytes derived from?

Answer 16

Neural crest cells

Question 17

Meningeal sheaths of optic nerve derived from?

Answer 17

Neural crest cells

Question 18

Schwann cells of ciliary nerves derived from?

Answer 18

Neural crest cells

Question 19

Sclera derived from?

Answer 19

Neural crest cells and mesoderm

Question 20

Trabecular meshwork derived from?

Answer 20

Neural crest cells

Question 21

Corneal epithelium derived from?

Answer 21

surface ectoderm

Question 22

Conjunctical epithelium derived from?

Answer 22

surface ectoderm

Question 23

epithelium, glands, skin cilia, caruncle derived from derived from?

Answer 23

surface ectoderm

Question 24

lacrimal drainage system derived from?

Answer 24

surface ectoderm

Question 25

lens derived from?

Answer 25

surface ectoderm

Question 26

Choroid derived from?

Answer 26

Mesoderm

Question 27

EOM fibres derived from?

Answer 27

Mesoderm

Question 28

Iris stroma derived from?

Answer 28

mesoderm

Question 29

Vascular endothelium derived from?

Answer 29

Mesoderm

Question 30

What day does optic primordium appear

Answer 30

22 days

Question 31

What day does Optic vesicle evaginate and neural crest cells migrate to surround vesicle

Answer 31

25 days

Question 32

What day does vesicle induce lens placode

Answer 32

28 days

Question 33

What day does eyelids folds appear

Answer 33

4-5 weeks

Question 34

What day does Invagination of optic lens and vesicle occur

Answer 34

2 months

Question 35

What day does hyaloids arter enter eye via embryonic fissure

Answer 35

2 months

Question 36

What day does Closure of embyonic fissure begin

Answer 36

2 months

Question 37

What day does pigments granules appear in RPE

Answer 37

2 months

Question 38

What day does primordia of lateral rectus and superior oblique muscles grow anteriorly

Answer 38

2 months

Question 39

What day does eyelid folds meet and fuse

Answer 39

2 months

Question 40

What day does migration of reinal cells begein

Answer 40

2 months

Question 41

What day does neural crest cells of endothelium migrate centrally

Answer 41

2 months

Question 42

What day does cavity of lens vesicle obliterated

Answer 42

2 months

Question 43

What day does bruch membrane appear

Answer 43

2 months

Question 44

What day does rods and cones differentiate

Answer 44

3 months

Question 45

What day does ciliary body start to develop

Answer 45

3 months

Question 46

What day does cortex veins pierce sclera

Answer 46

3 months

Question 47

What day does retinal vessel grow into NFL near optic disc

Answer 47

4 months

Question 48

What day does folds of ciliary processes paaer

Answer 48

4 months

Question 49

What day does iris sphincter develop

Answer 49

4 months

Question 50

What day does Descemet mebrane forms

Answer 50

4 months

Question 51

What day does SChlemm canal appear

Answer 51

4 months

Question 52

What day does Hyaloid system start to regress

Answer 52

4 months

Question 53

What day does glands and cillia develop

Answer 53

4 months

Question 54

What day does photoreceptor develop inner segment

Answer 54

5 months

Question 55

What day does choroidal vessels form layers

Answer 55

5 months

Question 56

What day does Iris stroma is vascualrised

Answer 56

5 months

Question 57

What day does eyelids begins to separate

Answer 57

5 months

Question 58

What day does ganglion cells thicken in macula

Answer 58

6 months

Question 59

What day does recurrent arterial branches joing the choroidal vessels

Answer 59

6months

Question 60

What day does dialtor muscle of iris form

Answer 60

6 months

Question 61

What day does outer segments of potoreceptors differentiate

Answer 61

7 months

Question 62

What day does central fovea start to thin

Answer 62

7 months

Question 63

What day does fibrous lamina cribrosa form

Answer 63

7 months

Question 64

What day does choroidal mealnocytes prodcue pigment

Answer 64

7 months

Question 65

What day does circular muscle form in ciliary body

Answer 65

7 months

Question 66

What day does anterior chamber angle complete formation

Answer 66

8 months

Question 67

What day does hyaloid system disappear

Answer 67

8 months

Question 68

WHen do retinal vessels reach the periphery

Answer 68

9 months

Question 69

WHen does myelination of optic nerve fibres complete

Answer 69

9 months

Question 70

When does pupiliary membrane disappear

Answer 70

9 months

Question 71

Failure of optic fissures to close cause

Answer 71

COloblomas

Question 72

Main type of collagen in lens capsule

Answer 72

type IV

Question 73

Hyaloid artery eventually becomes?

Answer 73

Central reintal artery

Question 74

regressing hyaloid canal is site of the future?

Answer 74

CLoquet canal

Question 75

WHen does lacrimal gland reflex tear production being?

Answer 75

>20 days after birth