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gestational sac
The gestational sac is the large cavity of fluid surrounding the embryo. During early embryogenesis it consists of the extra-embryonic coelom, also called the chorionic cavity. By approximately 9 weeks of gestational age the amniotic sac has expanded to occupy the majority of its volume, eventually filling the entire space. The gestational sac is usually contained with the uterus. It is the only available structure that can be used to determine if an intrauterine pregnancy exists until the embryo is identified.
On obstetric ultrasound, the gestational sac is a dark ("anechoic") space surrounded by a white ("hyperchoic") rim.
==Structure==
The gestational sac is spherical in shape, and usually located in the upper part of the fundus of the uterus. By approximately 9 weeks of gestational age, the amniotic sac has expanded to occupy the majority of the volume of the gestational sac, eventually expanding to reduce the extraembryonic coelom to a thin layer between the amnion membrane and the mesoderm. By then, the gestational sac is usually simply called the "amniotic sac".
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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