Gestational sac
An artificially colored image of the contents in the cavity of the uterus seen at approximately 5 weeks of gestational age by obstetric ultrasonography.
This is an artificially colored image of the contents in the cavity of the uterus seen at approximately 5 weeks of gestational age by obstetric ultrasonography. It shows the gestational sac, yolk sac, and embryo.
Source
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"Ultrasound of embryo at 5 weeks, colored."
https://commons.wikimedia.org/wiki/File:Ultrasound_of_embryo_at_5_weeks,_colored.png
Wikipedia Commons
CC BY-SA 3.0.
