Prenatal Development Week 4. Prenatal Development 3 Trimester’s: 1 st, 2 nd & 3 rd 3 Periods...
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Transcript of Prenatal Development Week 4. Prenatal Development 3 Trimester’s: 1 st, 2 nd & 3 rd 3 Periods...
Prenatal Development
Week 4
Prenatal Development
• 3 Trimester’s: 1st, 2nd & 3rd
• 3 Periods (stages): Germinal, embryonic & fetal
• 38 weeks
Milestones of Prenatal Dev.Table 2.2 (p. 61)
• 1st Trimester – weeks 1 to 12 (germinal/zygote, embryonic, & early part of fetal period)
• 2nd Trimester - weeks 13 to 24 (fetal period)
• 3rd Trimester - weeks 25 to 38 (fetal period)
Part 2
Stages of Prenatal Development
Gestation- lasts about 38 wks
Germinal Stage (zygote): First 14 days of the pregnancy
• Zygote implants into the uterus lining…
Stage of the Embryo
1) The endoderm layer- will develop into internal organs & glands
2) The ectoderm layer- become the parts of the body that maintain contact w/ the outside world: the nervous system;
• 3) The mesoderm layer- muscles, cartilage, bone, sex organs (reproductive sys), & the heart (circulatory sys).
The Prenatal Environment
Amniotic sac- watertight membrane filled w/ fluid…
The placenta-organ through which the organism/mother exchange materials.
• The umbilical cord-links the organism to the placenta; it serves as a filter…
Stage of the fetus
• The main changes for the fetus are to develop further the already formed organ structures & increase in size & weight
• From 3- 4 mos.,
• By 4th mos. mother produces colostrum …
• By 4th mos. lanugo and covers the body and vernix is secreted.
Conception to Birth• http://www.youtube.com/watch?v=fKyljukBE70• Start at 2 min; STOP at 5:52
Small Group Discussion• How has your culture influenced the way a woman/man,
experiences pregnancy (i.e. – beliefs, practices, traditions, etc.)?
• What about the father/partner?
The 9th month- Pregnancy around the World
• http://www.pri.org/stories/2014-02-23/video-shes-seven-months-pregnant-and-still-working-fields
• Stop at 5 min 10 seconds
Teratogens
Non-genetic agents that can cause malformation in the embryo / fetus. 1930’s: Mid 1940’s: 1960’s: