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25 Cards in this Set
- Front
- Back
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On implantation, what two layers does the trophoblast form?
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Cytotrophoblast and synctiotrophoblast
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What happens at the site of contact between the zygote and the uterus?
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Decidual reaction (by differentiating into decidual cells)
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What can placenta previa cause?
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Bleeding because of premature placental separation during pregnancy
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Pregnancy in an abnormal location? How does it survive?
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ectopic pregnancy; increased vascularity
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What is the lumenal side of the trophoblast called? (which pole)
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Abembryonic pole
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What forms between the yolk sac and the original trophoblast lining?
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Extraembryonic mesoderm
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What forms inside the extraembryonic mesoderm once it separates into two layers?
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Extraembryonic coelom (chorionic cavity)
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Part of the yolk sac breaks off, what keeps the embryo in contact with the original trophoblast?
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Connecting stalk
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What does the connecting stalk eventually become?
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Connection for the umbilical arteries and veins
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Where are trophoblastic lacunae found? What occurs within them?
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Within the synctiotrophoblast; they fill with blood from maternal sinusoids
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What grows into the blood-filled trophoblastic lacunae?
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Primary chorionic stem villi
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What differentiates primary and secondary chorionic stem villi?
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Extraembryonic mesoderm penetrates to the middle of it.
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What differentiates secondary from tertiary chorionic stem villi?
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Presence of blood vessels
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Ultimately, what 4 layers separate embryonic blood from the maternal blood?
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endothelium of villus capillaries, loose connective tissue in villus core, cytotrophoblast, syncytiotroblast
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Between the amniotic cavity and the chorionic cavity, what changes as pregnancy develops?
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The amnion expands and takes the place of the chorion.
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What is the condition of polyhydramnios or oligohydramnios?
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Excessive & insufficient amniotic fluid
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What can lead to polyhydramnios?
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Poor absorption from the fetus, which normally returns water to mother's circulation
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What can occur with tears in the amnion?
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Contriction or amputation of appendages
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What layer of the uterus covers the embryo?
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Decidua capsularis
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Which layer of the uterus contains the other endometrial cells on the wall of the uterus?
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Decidua parietalis
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What part of the uterus lends to forming the mature placenta?
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Decidua basalis
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As the embryo grows into the uterus, which part of the chorion is associated with the decidua basalis?
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chorion frondosum
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In what month does the decidua capsularis disintegrate?
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5th-6th month
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Describe the difference in twins as it relates to oocytes.
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Dizygotic (fraternal) comes from two separate eggs; monozygotic (identical) forms from splitting of single embryo
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Desribe the difference in twins as it relates to fetal membranes.
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Dizygotic-will not share fetal membranes
Monozygotic-may share fetal membranes |
