Page 24 - SONO 260 THE FIRST TRIMESTER
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                                                                                                          ž The amniotic cavity contains simple-appearing amniotic fluid and the developing embryo.
ž The amniotic membrane, or amnion, can be seen within the gestational sac as a thin, echogenic line loosely surrounding the embryo.
ž The amnion and chorion typically fuse around the middle of the first trimester, but may not be totally fused until 16 weeks gestation.
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