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time between conception and birth
prenatal period
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conception to the first 8 weeks
embryonic period
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8 weeks to birth
fetal period
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At the start of the embryonic period (week 1), __
- fertilization occurs in the lateral 3rd of fallopian tube
- A zygote does cell division & becomes a morula with 12-16 cells to the uterus.
- Blastocyst forms.
(page 5 & 6 on slide)
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The __ of the __ becomes the placenta & the __ becomes the fetus.
trophoblast (provide nutrients); blastocyst; inner cell mass
(page 7 & 8 on slide)
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During implantation (week 2), the __ differentiates into __
- inner cell mass;
- the epiblast (turn into fetus & amniotic sac) & hypoblast (turn into yolk sac)
(page 10 on slide)
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Week 3, __ occurs with the formation of a __ & __
- gastrulation;
- primitive streak
- 3 primary germ layers (ectoderm, mesoderm, endoderm);
(Migration of cells from the epiblast through the primitive streak or node forms the 3 layers.)
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The primitive streak forms __
caudally
(page 12 on slide)
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A __ forms in the mesoderm & __ occurs, first the __ is formed. Then a __ to form a __.
- notochord;
- neuralation;
- neural plate;
- neural groove;
- neural tube (above notochord)
(page 15 & 18 on slide)
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Week 4, after the neural tube is formed, __
the blastocyst is now an embryo takes a cylindrical shape & the adult body plan starts to form
(page 20 & 24 on slide)
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The ectoderm becomes the __
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The mesoderm becomes __
- muscles
- connective tissue
- heart
- kidneys
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The endoderm becomes the __
- lining of respiratory system
- lining of digestive tract
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