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head-neck.pdf10.07 MB
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Day 1:
Fertalization
Day 2:
cleavage
ends with 2 blastomeres
Day3:
Morula is formed
compaction occurs
Day 4:
Inner and outer cell mass forms (embryoblast and trophoblast)
embryo is called blastocyst
Day 5:
Hatching (zona pellucida is gone)
Day 6:
Implantation into uterine wall begins
Day 7:
Implantation occurs
Day 8:
Bilaminar disk formation:
- Trophoblast differentiated into cytotrophoblast and syncytiotrophoblast
- embryoblast differentiated into epiblast and hypoblast
Amniotic cavity appears
Day 9:
LACUNAR STAGE
Primitive yolk sac is formed (attached to wall of cytotrophoblast)
Day 11:
extraembryonic reticlum is formed (later becomes extraembryonic mesoderm)
surface epithelium of uterus almost covers defect
Day 12:
maternal sinusoids invaded by syncytiotrophoblast
UTEROPLACENTAL CIRCULATION BEGINS
Day 13:
Secondary Yolk sac appears
The exocoelomic cavity are pinched off (exocoelomic cysts)
Primary villi appear
Day 14:
Chorionic cavity is formed (from extraembryonic mesoderm)
embryo and cavity are supported by connecting stalk which:
-becomes the future umbilical cord
-column of mesoderm
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Respiratory system (1).pdf2.18 MB
Respiratory (2).pdf1.45 MB
Respiratory (3).pdf1.79 MB
Respiratory (4).pdf8.61 KB
Respiratory system lecture 5.pdf1.86 MB
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