Prenatal stage of development

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Prenatal stage of development

  1. 1. Chapter 4: Prenatal Development and Birth Importance: 1. Hereditary endowment is fixed 2. Favorable conditions in the mother’s body 3. Proportionally greater growth and development takes place 4. Influence of significant people
  2. 2. Major Phases of Prenatal Development  Scientific term used to describe baby-to- be  Major developments in each period
  3. 3. I. Germinal Period Period of the Zygote 8-14 days or Weeks 1-2 Conception until implantation
  4. 4. Germinal Period
  5. 5. Germinal Period
  6. 6. Germinal Phase
  7. 7. Germinal Phase
  8. 8. Germinal Phase
  9. 9. Germinal Period
  10. 10. Germinal Period
  11. 11. Germinal Period
  12. 12. Germinal Period
  13. 13. Germinal Period
  14. 14. Implantation
  15. 15. Implantation
  16. 16. II. Period of the Embryo  When zygote is completely embedded in the uterine wall  Body structures and internal organs develop  3 layers begin to form in the embryo: 1. Ectoderm: hair, skin, nervous system 2. Mesoderm: muscles, bones, circulatory system 3. Endoderm: digestive system and lungs
  17. 17. Period of the Embryo  Embryo rests in a sac called amnion amniotic fluid shock-absorbing protection; constant temperature  Chorion: 2nd membrane after about a month of development; helps form the placenta  Weeks 3-8
  18. 18. Period of the Embryo  3-week old: salamander  8-week old: most of the organs found in a mature human are in place; visible eyes, jaw, arms and legs  About 1 inch long and weighs only a fraction of an ounce
  19. 19. Period of the Embryo
  20. 20. Period of the Embryo
  21. 21. Period of the Embryo
  22. 22. Period of the Embryo
  23. 23. Period of the Embryo
  24. 24. III. Period of the Fetus  Weeks 9-38  Much larger and bodily systems begin to work (respiration, digestion, vision)  By 22-28 weeks, most systems function well enough that a fetus has a chance to survive age of viability
  25. 25. Period of the Fetus  Distinct baby-like look  May still have trouble breathing and cannot regulate body temperature yet  Fetus starts to behave as movements become obvious  Begins to hear sounds, taste different flavors
  26. 26. Period of the Fetus: 3rd Month
  27. 27. Period of the Fetus: 4th Month
  28. 28. Period of the Fetus: 5th Month
  29. 29. Period of the Fetus: 6th Month
  30. 30. Period of the Fetus: 7th Month
  31. 31. Period of the Fetus: 8th Month
  32. 32. Period of the Fetus: 9th Month
  33. 33. Changes in a pregnant woman’s body

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