fetal development. prenatal period 3 stages cleavage = fertilization to 2 nd week embryonic stage =...
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![Page 1: Fetal Development. Prenatal period 3 stages Cleavage = Fertilization to 2 nd week Embryonic stage = end of 2 nd week through 8 th week Fetal stage = 9](https://reader035.vdocuments.net/reader035/viewer/2022062721/56649f1e5503460f94c35bd5/html5/thumbnails/1.jpg)
Fetal Development
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Prenatal period3 stages
• Cleavage = Fertilization to 2nd week
• Embryonic stage = end of 2nd week through 8th week
• Fetal stage = 9th week through birth
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Trophoblast secretes hCG to maintain corpus luteum
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Fig. 23-10
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Multi-part development model
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6. Early blastocyst (yellow = inner cell mass)
7. Mid blastocyst (yellow = ectoderm, orange = endoderm)
8. Late blastocyst with implantation
9. Inner cell mass
10. Trophoblast
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4 part Embryonic Development Model
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Upper right model (Blastocyst)
Inner cell mass= at pointer
Purple slit = amnion
Yellow = preliminary yolk sac
34 = trophoblast
34
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Upper left model(Embryo)
42 = Connecting stalk (at pointer)
40 = amniotic cavity
38 = Yolk sac
42
40
38
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Upper left model(Embryo)
Chorionic villi = at pointer 46
Embryonic disc – between amnion & yolk sac
46
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48 = Chorion
Lower Right Model
49 = umbilical cord
38 = yolk sac
49
38
48
47
47 = Amnion
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Lower Left Model
47
49
51
47 = amnion
49 = Umbilical cord
50 = Large chorionic villa (Fetal placenta)
51 = Chorion (entire structure fused with amnion)
50
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