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13 Cards in this Set
- Front
- Back
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Dizygotic |
Fraternal |
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Monozygotic |
Identical |
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Dizygotic twins arise from 2 seperately.... |
Fertilized ova |
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Monozygotic twins arise from a single fertilized egg that divides |
Resulting in 2 identical fetuses May be 1 or more placentas, chorion, amniotic sacs. If division occurs early 0-4 days preconception there will be 2 amnion and 2 chorions. |
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If division occurs at 4-8 days |
1 chorion 2 amniotic sacs |
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If division occurs after 13 days |
Division may be incomplete resulting in conjoined twins |
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Thoracopagus |
Joined at thorax |
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Omphalopagus |
Joined at ant. Wall Most successful surgically. |
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Craniopagus |
Joined at cranium |
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Pygopagus |
Joined at pelvis |
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Ischiopagus |
Attached at hip |
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Vanishing twin |
If demise occurs very early complete resoprtion of both embryo and gestational or early placenta may occur Vanishing twin |
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Poly oli sequence |
Diamniotic pregnancy with Polygydramnios in one sac Sever oligo. And smaller twin in other sac. Stuck twin Placental insufficiency |
