Embryology of the Eye Flashcards Preview

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Flashcards in Embryology of the Eye Deck (49):
1

what are the four sources responsible for development of the eye

neuroectoderm
surface ectoderm
mesoderm
neural cest cells

2

neuroectoderm give rise to

retina and posterior layers of the iris and optic nerve

3

surface ectoderm gives rise to

lens and corneal epithelium

4

mesoderm gives rise to

fibrous and vascular coats of the eye

5

neural crest cells give rise to

choroid, sclera, and corneal endothelium

6

the optic vesicles grow out of the

forebrain

7

the optic vesiicles elongate to form

optic stalks

8

the cavity of the optic vesicles is continous with the

forebrain

9

surface ectoderm forms

lens placodes

10

the lens placodes will form________

lens pits which will invaginate to form lens vesicle

11

the distal ends of the optic stalk will widen and

form optic cups and become associated with the lens vesicle

12

what does the hyaloid artery supply

the developing lens

13

the optic stalk becomes

optic nerve

14

the hyaloid artery will become

central artery of the retina (a branch from the opthalmic artery)

15

where does the retina develop from

walls of the optic cup

16

the outer layer of the optic cup becomes

pigmented retina

17

the inner layer of the optic cup becomes

neural (unpigmented) retina

18

what are deepest in the retina

photoreceptor cells

19

the ciliary body dervies from

choroid mesenchyme and both layers of the optic cup

20

the ciliary process is from

outer and inner layer of the optic cup

21

ciliary muscles are derived from

choroid mesenchyme at the anterior edge of the optic cup

22

_____________forms from the front edge of the optic cup

iris

23

edges of the optic cup grow together to form

pupil

24

the lens is derived from

surface ectoderm

25

what are the sources of the cornea

surface ectoderm, mesoderm, and neural crest cells

26

mesenchyme that surrounds the optic cup develops into

choroid and sclera

27

the conjunctival sac is

the space between the cornea and the eyelids (lined by ectoderm)

28

the eyelids are composed of what

surface ectoderm with a core of mesenchyme (neural crest)

29

orbicularis oculi is derived from

2nd pharngeal arch

30

how do the lacrimal glands form

they form from invaginations of the ectoderm of the conjunctival sac

31

the ________develops from a space between the lens and the corna

anterior chamber

32

the _____________develops from a space that forms in the mesenchyme posterior to the iris and anterior to the lens

posterior chamber

33

vitreous humor is derived from

neural crest mesenchyme

34

the extrinsic eye muscles from from

preotic somites

35

congenital retinal detachment

failure of the two layers of retina to fuse,

36

coloboma

defect involved in improper closing of the choroid fissure in a gap in the iris or iris and retina

37

cyclopia

occurs when there is a fusion in the midline

38

synopathlamia

incompletely fusion of the eyes

39

clyclopia

defect of the midline structures; incompatible with life

40

micropthalmia

small normal appearing eye but may lack a lens

41

anophthalmia

congenital absence of eye tissue

42

persistent pupillary membrane

normally covers the anterior surface of the lens and disappears during developemnt; remains as strands of CT tissue spanning the pupil but will rarely interfere with vision

43

congenital glaucoma

increase in intraocular pressure; defect in the slceral venous sinus

44

congenital cataract

lens opacity present caused by rubella, chicken pox, herpes or geneitc

45

anridia

absence of an iris; defect in neural crest

46

color of irisis acquied

8-10 months

47

congenital aphakia

absence of a lens

48

congenital ptosis

levator palpebrae superioris or loss of innveration to the muscle

49

retinoblastoma

neuronal tumor arising from the retina; the most common primary intraocular malignancy of childhood