1. Fertilization and Implantation Week One of Human Development

2. The Embryonic and Fetal Periods

3. During the 4th Week Primordial Germ Cells Migrate into the Posterior Body Wall of the Embryo

4. Gametogenesis of Germ Cells in the Male and Female reduces the number of chromosomes in the germ cells from 46 to 23

5. Spermatogenesis and Differentiation

6. Sperm produced in the Seminiferous Tubules are stored in the Epididymis

7. Gametogenesis of Germ Cells in the Male and Female

8. Maturing Follicle
Number of Primordial Follicles at 5 months: 7 million
at birth: million
at puberty: 400,000 remain
Fewer than 500 follicles will be released during reproductive years

9. Changes in the condition of the uterus and corresponding changes in the ovary during a regular menstrual cycle
Key Events
1.) maturation of a single oocyte and
follicle
2.) proliferation of the uterine
endometrium
3.) the process of ovulation
4.) developpment of the follicle into
corpus luteum
5.) if no implantation, the degeneration
of the corpus lteum and the sloughing
off of the uterine endometrium

11. Your Most Fertile Time
A woman’s most fertile period is typically several days before, and no
more than one day after, ovulation.
To increase chances of becoming pregnant, women should monitor
body temperature, cervical mucus production, and LH levels.

12. Fertility Fact
An average couple who do not practice contraception and have
intercourse twice a week have a better than 50% chance of
fertilizing any given oocyte. Because half of all embryos are
aborted, the chance that one month’s intercourse will produce a term
pregnancy is thus about 25%.

13. Summary of the Ovarian Cycle, Fertilization and Human Development during the First Week

15. The Female Reproductive Organs

16. Miracle of Life: The Egg’s Journey

17. Fertilization is a Complex Interaction Between Sperm and Oocyte

18. Miracle of Life: The Sperm’s Journey

19. Cleavage of the Zygote and Formation of the Blastocyst

20. Cleavage and Transport down the Oviduct

21. Miracle of Life: Cleavage
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22. Embryonic Stem Cell Research

23. Abnormal Implantation Sites of the Blastocyst

24. How Dizygotic Twins Develop

25. How Monozygotic Twins Develop

26. Conjoined Twins (1 in 200,000 live births)

27. Parasitic Twins (1-2,000,000 births)

28. Implantation of the Blastocyst (Day 7)

29. By 8 Days, the Amniotic Cavity Appears

30. By 9 Days, the Embryo is Completely Implanted in the Uterine Endometrium

31. Days 10-13 of Embryonic Development

32. Days 12-15 of Embryonic Development

33. In vitro Fertilization