Gestational sac
Cavity of fluid surrounding an embryo / From Wikipedia, the free encyclopedia
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The gestational sac is the large cavity of fluid surrounding the embryo. During early embryogenesis, it consists of the extraembryonic coelom, also called the chorionic cavity. The gestational sac is normally contained within the uterus. It is the only available structure that can be used to determine if an intrauterine pregnancy exists until the embryo can be identified.
Quick Facts Details, Carnegie stage ...
Gestational sac | |
---|---|
Details | |
Carnegie stage | 6a |
Days | 12 |
Precursor | Heuser's membrane |
Identifiers | |
Latin | saccus gestationalis, coeloma extraembryonicum, cavitas chorionica |
MeSH | D058746 |
TE | sac_by_E5.8.0.0.1.0.1 E5.8.0.0.1.0.1 |
Anatomical terminology |
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On obstetric ultrasound, the gestational sac is a dark (anechoic) space surrounded by a white (hyperechoic) rim.