Human Development
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Transcript of Human Development
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Human Development
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27.9 Relate the structure of sperm to its role in fertilization.
Describe the mechanisms that prevent more than one sperm from fertilizing an egg and that prevent hybridization between different species.
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Describe this picture…
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27.10 Describe the process and results of cleavage. Explain how identical and nonidentical twins form.
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Describe this picture…
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27.11 Describe the process of gastrulation and the resulting arrangement of the embryo.
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Establish 3 cell layers ectoderm
outer body tissues skin, nails, teeth nerves, eyes, lining of mouth
mesoderm middle tissues
blood & lymph, bone & notochord, muscle
excretory & reproductive systems endoderm
inner lining digestive system lining of respiratory, excretory &
reproductive systems
Gastrulation
ectoderm
mesoderm
endoderm
protostome vs. deuterostome
gastrulation inprimitive chordates
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27.12 Explain how organs form after the development of a gastrula.
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Explain how changes in cell shape, induction, cell migration, and
apoptosis contribute to development
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Pattern formation during embryonic development is controlled by ancient genes
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27.15 Describe the initial embryonic stages and the formation and functions of the extraembryonic membranes in humans.
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Human fetal development5 weeks4 weeks
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Human fetal development10 weeks
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Human fetal development
14 weeks 20 weeks
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The fetus just spends much of the 2nd & 3rd trimesters just growing
…and doing various flip-turns & kicks inside amniotic fluid
Human fetal development
Week 20
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24 weeks (6 months; 2nd trimester)Human fetal development
fetus is covered with fine, downy hair called lanugo. Its skin is protected by a waxy material called vernix
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30 weeks (7.5 months)Human fetal development
umbilical cord
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32 weeks (8 months)Getting crowded in there!!
The fetus sleeps 90-95% of the day & sometimes experiences REM sleep, an indication of dreaming