Glossary Y

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Glossary Y
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Yolk sac

A membranous structure outside of the embryo that serves as the early site for the formation of blood. The yolk sac is connected to the developing midgut (intestine) through a channel called the vitelline or omphalomesenteric duct.

The yolk sac can usually be seen on transvaginal ultrasound by 5 weeks'