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Flashcards in OPT1210 Exam 3 Deck (103)
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1

What is the joining of an ovum and a sperm called?

fertilized zygote

2

What are the six stages of development?

Fertilization (Day 1)
Pre-embryonic (Weeks 1-2)
Embryonic (Weeks 2-9)
Fetal (Weeks 9-Delivery)
Neonate (first 4 weeks after birth)
Infant (after 4 weeks)

3

What are the stages of Embryogenesis?

Fertilization
2-cell zygote
4-cell zygote
8-cell zygote
16-cell zygote.......
Morula (64-cells)
Blastula (100 cells)
Gastrula
Embryo

4

In what stage does the Zona Pellucida disintegrate to release the blastocyst?

Pre-embryonic

5

What does the gastrula initially separate into?

Epiblast - Primitive streak
Hypoblast

6

When the Zona Pellucida disintegrates, what is released?

Blastocyst

7

What do the inner and outer layers of the blastocyst develop into?

Trophoblast - outer cells form placenta
Embryoblast - inner cells develop into embryo

8

The gastrula divides into three primary germ layers. What are they?

Ectoderm - epidermis, brain neuron, pigment
Mesoderm - muscle cells, RBCs
Endoderm - pancreas, lung, thyroid

9

Embryonic mesoblast consists of what 3 layers?

Outer Neuroectoderm
Middle Mesoderm
Inner Endoderm

10

By what day does the embryo have a head to tail orientation?

Day 19

11

By Day 19, the Neuroepithelium shows polarity and has what orientation?

Apex up, Base down

12

By Day 22, the Neuroepithelium has what orientation?

Cell apex inside, call base out

13

By what Day do the neural folds fuse and become neural tube?

Day 22

14

By what Day does the optic primordium form?

Day 22

15

What appears by Day 23 as an evagination of forebrain (prosencephalon)?

Optic Pit

16

By what day does the neural tube close?

Day 23

17

The optic stalk develops into what?

optic nerve

18

The optic vesicle develops into what?

Globe

19

The eye fields for optic vesicle at what day?

Day 25

20

The optic vesicle induces the lens placode in what week?

Weeks 3-4

21

When does the right and left optic primordia meet at the optic chiasma?

Weeks 5-6
Stage 11

22

When does the optic cup and lens vesicle invaginate?

Day 27
Stage 11

23

When does the embryonic fissure close?

Day 33

24

What feeds the lens and fills the embryonic fissure in Weeks 5-6?

Hyaloid artery

25

What are floaters?

Remnants of the hyaloid artery

26

When do eyelid folds appear?

Weeks 5-6
Stage 11

27

What do the eyelid folds become?

layers of the retina

28

In what weeks do the eyelids form?

Weeks 8-10

29

In what weeks are the lens placode indented by lens pit?

Weeks 8-10

30

When is the cornea formed?

Weeks 7-8