<h2>What is the yolk sac?</h2>
The yolk sac is a membraneous sac attached to the embryo and is&nbsp;the first anatomical structure identified within the gestational sac. The yolk sac plays a critical role in embryonal development by providing nutrients, serving as the site of initial blood creation (haematopoiesis), providing hormones, metabolic and immunological functions and contributing to the development of fetal gastrointestinal and reproductive systems.
As the pregnancy advances, the yolk sac progressively increases from the 5th to end of the 10th gestational week, following which the yolk sac gradually disappears and is often sonographically undetectable after 14-20 weeks.
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From: fetalMedicine
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An ultrasound in pregnancy can be either done as a “routine” ultrasound,&nbsp;an anatomy sonogram, usually between 18-20 weeks or it is done for specific reasons which usually depend at the time of pregnancy. There are essentially three different types of ultrasounds, depending on how much information is required.

Ultrasound

What Is the Yolk Sac During Pregnancy?

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