DB #5 Timeline

Module 5 Discussion Board –

Human Growth and Development

Directions: Complete this assignment and post to the Module 5 Discussion Board. Then respond to two peers’ post Blackboard.

Response 1:

· Critique your peer’s post

· Explain the 3 germ layers and tell one part/organ that arises from each layer

Response 2:

· Critique your peer’s post

· Include 2 developmental changes associated with aging.

I. Add the following terms into the appropriate location on this chart

·

1. Cleavage of zygote

2. Earbuds form

3. Fertilization

4. Major Blood Vessels form

5. Neurulation

6. Morula

7. Implantation

8. Placenta begins to form but still relies on Corpus luteum for hormone support

9. Trophoblast and Inner Cell Mass

10. Face forms

11. Placenta is fully formed and gives off its own hormones independent of corpus luteum

12. Capacitation

13. Eyebrows and hair is visible

14. Arm and Leg Buds

15. Chorion forms

16. Organ Systems continue to grow

17. Differentiation of male and female sex organs

18. Blastocyst

19. Assumes upside down position

20. Gastrulation

21. Yolk Sac Forms

22. Digestive System ducts form

23. HCG begins to be secreted by chorion

24. Primitive Streak

25. Parturition

26. Amnion forms

27. Blastocyst moves out of uterine tube into uterus

Germinal Period From __ to __	Embryonic Period From __to __	Fetal Period From __ to__

II. Explain the following developmental periods. Tell us what occurs during

a. Implantation

b. Gastrulation

c. Neurulation

III. Name and explain the 3 parts of labor. Be sure to include that the placenta is composed of the __________ layer from the embryo and the mother’s __________________.