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24 Cards in this Set
- Front
- Back
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24 hours
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fertilization
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30 hours
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zygote divides
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Day 3
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morula
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Day 4
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morula enters uterus
blastocyst formation |
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Day 5
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zona pellucida degenerates
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Day 6
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Implantation begins
cyto and syncytiotrophoblast form |
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Day 7
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superficial implantation
hypoblast appers on inner cell mass |
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Day 14
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Implantation completed
primary chorionic villi develop |
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Day 15
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primitive streak and node form
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Day 16
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allantois appears
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Day 17
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notochordal process
paraxial,lateral plate, and intermediate mesoderm |
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Day 18
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Paraxial mesoderm organizing into somitomeres
intraembryonic coelomic cavity somato/splanchnopleure |
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day 19
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oropharyngeal membrane
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day 20
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notochordal plate
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day 21
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8th somitomere differentiates into 1st occipital somite
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Day 22
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solid notochord forms
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Day 26
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oropharyngeal membrane ruptures
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20 wks
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placental membrane now become 2 layers
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week 4
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primary brain vesicles
branchial arches form thyroid diverticulum oropharyngeal membrane rupture respiratory structures develop tongue development |
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Day 25
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rostral neuropore closure
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day 26
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caudal neuropore closure
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week 5
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secondary brain vesicles
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wks 25-28
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sufficient terminal bronchi for extrauterine life
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wks 28-32
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sufficient surfactant to maintain extrauterine life
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