Embryonic Structure
gestational sac
Subclass of:
Embryonic Structures
Definitions related to gestational sac:
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Round-shaped structure usually located in the upper fundus of the UTERUS in early pregnancy. It comprises EMBRYO; AMNIOTIC FLUID; and YOLK SAC. It is visible in PRENATAL ULTRASONOGRAPHY by the fifth week of pregnancy. Its size is often used to determine and monitor GESTATIONAL AGE; FETAL GROWTH; and PREGNANCY COMPLICATIONS.NLM Medical Subject HeadingsU.S. National Library of Medicine, 2021
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The sac that envelops the embryo. It is composed of extraembryonic membranes.NCI ThesaurusU.S. National Cancer Institute, 2021
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