Which fetal membrane is the outermost and is typically obliterated by the amnion between 12 and 16 weeks?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $24.99Unlock all

Prepare for the ARRT Ultrasound Test with comprehensive study tools including flashcards and multiple choice questions, all with detailed explanations. Ace your exam with confidence!

Multiple Choice

Which fetal membrane is the outermost and is typically obliterated by the amnion between 12 and 16 weeks?

Explanation:
The outermost fetal membranous layer is the chorion. It surrounds the developing embryo and lies just outside the amnion. The amnion forms inside and gradually expands, eventually enveloping and fusing with the chorion. This fusion typically occurs around 12 to 16 weeks, obliterating the space between them (the chorionic cavity) and creating the amniochorionic membrane that encases the fetus. The yolk sac and allantois are other fetal membranes with different roles and positions, and they do not become the outermost layer or get obliterated by the amnion in this way.

The outermost fetal membranous layer is the chorion. It surrounds the developing embryo and lies just outside the amnion. The amnion forms inside and gradually expands, eventually enveloping and fusing with the chorion. This fusion typically occurs around 12 to 16 weeks, obliterating the space between them (the chorionic cavity) and creating the amniochorionic membrane that encases the fetus. The yolk sac and allantois are other fetal membranes with different roles and positions, and they do not become the outermost layer or get obliterated by the amnion in this way.

More Multiple Choice Questions
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy