Embryonic Development Flashcards Preview

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Flashcards in Embryonic Development Deck (64)
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Ovum fertilization by sperm produces

Zygote

1

During 7 days after fertilization, single-celled zygote turns into

Gastrula

2

Zygote = ____ cell
Two-cell stage = _____ cells
Four-cell stage = _____ cells
Morula
Blastula
Gastrula

1, 2, 4

3

Implantation begins on day:

8

4

Around time of implantation, at the point of development called ________, cells are dividing more rapidly on one side of embryo than the other

Gastrulation

*layers that will eventually form 3 distinct regions of the body are visible under microscope

5

Three germ layers:

Ectoderm
Mesoderm
Endoderm

6

Ectoderm will form...

Integumentary
Some skeletal
Nervous
Some endocrine
Respiratory
Digestive

7

Mesoderm will become...

Skeletal
Muscular
Endocrine
Cardiovascular
Lymphatic
Urinary
Reproductive

8

Endoderm will become...

Some endocrine
Respiratory
Digestive
Some urinary
Some reproductive

9

Temporary nourishment for embryo is from what?

Yolk sac

10

What contains fluid that protects embryo?

Amnion - amniotic fluid

11

What encapsulates the amnion and invades the endometrium for the formation of the placenta?

Chorion

12

1

Ovary

13

2

Primary oocyte

14

3

Oocyte with corona radiata

15

4

Developing fluid filled vesicular follicles

16

5

Ovulating follicle

17

6

Corpus luteum

18

7

Corpus albicans

19

8

Mature ovum discharged from follicle

20

9

Fimbriated end of oviduct

21

10

Ovum in oviduct with sperm ready to penetrate (fertilization first day -B)

22

11

Oviduct

23

12

Cleavage of fertile ovum (C)

24

13

Morula (third day -D)

25

14

Embryonic vesicle enters uterus (4th or 5th day)

26

15

Implantation of vesicle begins in endometrial epithelium (7th day)

27

16

Corpus of uterus

28

17

Fundus of uterus

29

18

Myometrium