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Various types of chorionicity and amniosity (how the baby's sac looks) in monozygotic (one egg/identical) twins as a result of when the blastocyst or embryo splits. Monoamniotic twins are identical or semi-identical twins that share the same amniotic sac within their mother's uterus. [1]
The amniotic sac, also called the bag of waters [1] [2] or the membranes, [3] is the sac in which the embryo and later fetus develops in amniotes. It is a thin but tough transparent pair of membranes that hold a developing embryo (and later fetus) until shortly before birth .
If one twin dies in utero, blood accumulates in that twin's body, causing exsanguination of the remaining twin. [2] In the case of monoamniotic twins the risk of complications is substantially higher because of additional potential umbilical cord entanglement and compression. [3] However, the perinatal mortality of monochorionic twins is fairly ...
After a baby's amniotic sac ruptured at 13 weeks, Texas parents were told there was only a 3% chance their son would live. How Texas 'miracle baby' might have been saved by his twin brother in the ...
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The gestational sac is spherical in shape, and is usually located in the upper part (fundus) of the uterus.By approximately nine weeks of gestational age, due to folding of the trilaminar germ disc, the amniotic sac expands and occupy the majority of the volume of the gestational sac, eventually reducing the extraembryonic coelom (the gestational sac or the chorionic cavity) to a thin layer ...
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