Pregnancy

2. Human Development

3. Stages of Development
Pre-Embryonic Development
Fertilization
Cleavage
Embryonic Development
Gastrulation
Organogenesis
Fetal Development

6. Fertilization

7. Ovum and Sperm

8. sperm head

10. Cleavage

11. Cleavage

12. Implantation

17. Embryonic Development

18. Embryonic Development

19. Fetal
Development

20. Fetal
Development

21. Development of
Reproductive
Organs

22. The
Placenta

23. The
Placenta

25. 6 months ultrasound

26. Changes in Uterus

27. Stages of Childbirth or
Labor
Dilation Stage
Expulsion Stage
Placental Stage

28. Dilation Stage

29. Expulsion Stage

30. Placental
Stage

31. Hormones Involved in
Labor
Estrogen
Fetal Oxytocin
Placental Prostaglandins
Maternal Oxytocin
Relaxin

32. Fig. 46-18
Estradiol Oxytocin
from
ovaries
Induces oxytocin
receptors on uterus
from fetus
and mother’s
posterior pituitary
Stimulates uterus
to contract
Stimulates
placenta to make
Prostaglandins
Stimulate more
contractions
of uterus
Positive
feedback
+
+

33. Mammary Gland

34. Hormones Involved in
Lactation
Estrogen & Progesterone
Prolactin Releasing Hormone
Prolactin
Human Chorionic Somatomammotropin
Oxytocin