Embryology/1st trimester OB review
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| What is the first organ to function within the embryo? | The heart.
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| When are limb buds recognizable? | By 6 weeks gestation.
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| In an 8 week old fetus, what structure can be visualized within the cranium? | cystic rhomboid fossa
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| At what week of gestation should the umbilical herniation rotate and descend back in to the fetal abdomen? | By week 11.
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| What is the most common occurrence of bleeding within the first trimester? | Subchorionic hemorrhage.
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| What is the earliest intragestational sac anatomy seen? | The yolk sac.
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| What is the double decidual sac sign? | The interface between the decidua capsularis and the echogenic highly vascularized decidua on the opposite wall of the endometrial cavity.
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| What week can and IUP be visualized sonographically? | Week 4
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| When does the fetal period begin? | weeks 11 and 12
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| What structure secretes progesterone and estrogen in early pregnancy? | The corpus luteum
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| What is another term for conceptual age? | embryologic age
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| How many days after conception does implantation take place? | 7-8 days
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| Where do the ovum and sperm usually unite? | The ampulla of the tube.
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| When does the decidual reaction start to happen? | right after implantation
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| What hormone does the trophoblastic cells secrete? | HCG
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| At how many days after conception should a hCG blood test show up positive? | 7-10 days
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| What is too little amniotic fluid? | oligohydramnios
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| What is too much amniotic fluid? | polyhydramnios
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| In early pregnancy what produces the amniotic fluid? | placenta
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