USIDMS Embroyology/1st Trimester
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| A morula has how many cells? | 16 cells
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| What is the membrane formed around a fertilized ovum to make it impermeable for other sperm? | zona pellucida
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| Approximately how many days after conception does fertilization occur? | 7-8 days
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| What is the first sonographic sign of pregnancy? | Gestational sac
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| What are the 3 primary germ layers of the embryo? | Mesoderm, ectoderm, endoderm
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| What is the absence of embyo/yolk sac in a gestational sac measuring 20-25 mm or greater? | Blighted ovum / anembryonic gestation
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| Failure to identify a yolk sac when gestational sac has reached ___ mm is indicative of an abnormal gestation | 12 mm
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| 95% of ectopic pregnancies implant where? | Fallopian tubes
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| What is the term for a twin pregnancy in which one gestational sac is in the uterine body (normal) and one is elsewhere (ectopic)? | Heterotopic
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| Is beta hCG quantitative or qualitative? | Quantitative
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| The primitive neural tube closes around which week? | Week 6
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| The corpus luteum secretes which hormone to support pregnancy? | Progesterone
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| The most accurate measurement of gestational age and pregnancy dationg from 6-12 weeks is | CRL (crown rump length)
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| Upper limits of normal nuchal translucency is ___ mm | 3 mm
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| Which lab value is a result of trophoblastic activity? | hCG
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| The heart begins to beat around ____ weeks | 5-6 weeks
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| A gestational sac should be seen transvaginally when beta hCG levels have reached ______ and transabdonimally when hCG levels have reached ______ | 1000 (TV), 1800-2000 (TA)
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| Limb buds can be visualized sonographically around weeks ______ | weeks 6-7
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| The musculoskeletal system is formed by which primary germ layer? | Mesoderm
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| The midgut herniation should regress by week ___ | 11
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