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First Trimester Ultrasound Fundamentals

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    • Introduction to First Trimester Ultrasound 10 xp
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      • Quiz
    • First Trimester Anatomy 10 xp
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      • Quiz
    • First Trimester Biometry 10 xp
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    • First Trimester Screening 10 xp
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      • Quiz
    • First Trimester Doppler 10 xp
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    • First Trimester Complications 10 xp
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      • Quiz

First Trimester Anatomy

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A comprehensive week-by-week guide to embryonic and early fetal development. This session focuses on identifying key sonographic markers like the gestational sac, yolk sac, and embryonic pole, as well as visualizing the early formation of the spine, brain vesicles, and limbs.

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Complete this lesson and pass the quiz to earn 10 Karma Points and move one step closer to your First Trimester Ultrasound Fundamentals Certification.

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1. The "double decidual sign" in early ultrasound confirms:
Twin gestation Intrauterine implantation via two concentric echogenic rings Normal yolk sac and embryonic pole Subchorionic hematoma
2. The primary role of the yolk sac in early embryonic development is:
Oxygen exchange with maternal blood Production of hCG Early hematopoiesis and nutrient transfer via vitelline circulation Formation of chorionic villi
3. The yolk sac is typically no longer sonographically visible after:
8 weeks 10 weeks 12 week 14 weeks
4. At 8 weeks, the correct spatial relationship between the yolk sac and the amniotic sac is:
Yolk sac is inside the amniotic sac Yolk sac is outside the amniotic sac, within the chorionic cavity Yolk sac is attached to the fetal abdomen Yolk sac is fused with the placenta
5. An embryonic heart rate below ___ bpm in the first trimester is a red flag for non-viable pregnancy:
60 bpm 80 bpm 100 bpm 120 bpm
6. Physiological midgut herniation into the base of the umbilical cord normally resolves by:
10 weeks CRL 11 weeks CRL 12 weeks CRL 14 weeks CRL
7. The correct technique for Crown-Rump Length (CRL) measurement requires the fetus to be in:
Full spinal extension Maximum flexion Neutral (neither flexed nor extended) position Any position — CRL is not position-dependent
8. The early Biparietal Diameter (BPD) is correctly measured in:
Trans-ventricular plane at the CSP Trans-thalamic plane with thalami and CSP visible Trans-cerebellar plane at the level of the cerebellum Mid-sagittal plane at the corpus callosum
9. Normal fetal cardiac axis in the first trimester points:
Straight anterior To the right at ~45° To the left at ~45° Posteriorly toward the spine
10. The most critical sonographic feature to document when assessing the first-trimester fetal spine is:
Number of vertebral bodies Posterior ossification center alignment Intact overlying skin covering Spinal cord diameter
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