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| day 5 (no more zona pellucida) |
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| embryoblast (with bare zone) and trophoblast (>> extra-embryonic membranes) |
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| implants in ovary, in body cavity, in fallopian tube, in cervix |
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| protects from implantation |
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| syncytiotrophoblast and cytotrophoblast |
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| encloses embryo within uterine wall |
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| when is implantation completed |
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| spread apart to form epiblast (under amniotic cavity) and hypoblast (over yolk sac) |
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| yolk sac cells are derived from |
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| syncytiotrophoblast, cytotrophoblast and extra-embryonic mesoderm |
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| extra-embryonic mesoderm, epiblast cells |
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| made of extra-embryonic mesoderm; becomes core of umbilical cord |
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| blastula cavity> yolk sac. amniotic cavity, chorionic cavity |
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| embryo is fed by _ until _ |
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| diffusion until umbilical vessels form in weeks 3 and 4 |
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| fetal component of placenta |
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| chorion (decidua is maternal duh) |
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| umbilical blood vessels grow out |
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| allantois / becomes / lined with |
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| extension of UG sinus / becomes urachus, which becomes median umbilical ligament / endoderm |
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| blood vessels in connecting stalk |
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| t/f vitelline vessels grow into chorionic villi |
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| false - umbilical vessels do |
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| know x-section of umbilical cord at 2 months |
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| t/f umbilical arteries are deoxygenated |
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| expansion of decidua _ obliterates the _ cavity |
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| chorionic villi proliferate under decidua _ |
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| when decidua capsularis expands, it meets decidua _ |
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| what is filled with maternal blood |
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| _ cavity is obliterated by expansion of amnion during month _ |
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| amnion grows out to cover the |
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| decidua between intervillous spaces |
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| what kind of blood in intervillous spaces |
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| partially oxygenated, but there's enough of it that the fetus only takes the oxygenated part |
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| _ vessels don't mix blood with umbilical vessels or vitelline vessels |
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| fetal hemoglobin has higher |
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| 02 affinity than maternal hemoglobin |
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