<Tr> <Td_colspan="2"> 10 - week - old human fetus surrounded by amniotic fluid within the amniotic sac </Td> </Tr> <Tr> <Td_colspan="2"> The amniotic sac opened during afterbirth examination . </Td> </Tr> <Tr> <Th_colspan="2"> Identifiers </Th> </Tr> <Tr> <Td_colspan="2"> Anatomical terminology (edit on Wikidata) </Td> </Tr>

When does the amniotic sac develop and when does it break