
12/12/2020
What a neat photo! Great info too :)
The Amniotic Sac is made up of multiple layers, so you may have a small leak that seals back up preterm- Or you may experience your water break at the start of labor and break again when you deliver baby.
•The chorion: is the outer membrane. It is in contact with the uterine wall. It is attached to the margins of the placenta.
Histologically, it is composed of 4 layers:
cellular layer.
dense reticulum.
pseudo-basement membrane.
outer trophoblast.
•The amnion: is a transparent greyish membrane which lines the chorion. It covers the foetal surface of the placenta and the umbilical cord. The amniotic sac contains the baby.
Histologically, it is composed of 5 layers:
cellular layer
basement membrane
compact layer
fibroblast layer
outer spongy layer adherent to the cellular layer of the chorion.
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•The sac of amniotic fluid is described as having two sections – the forewaters (in front of baby’s head) and the hind waters (behind baby’s head). A ‘hind water leak’ refers to an opening in the the amniotic membranes behind the baby’s head. Often this is experienced by the woman as an occasional light trickle as the fluid has to run down the outside of the sac and past baby’s head to get out.
•During labour forewaters are formed as the lower segment of the uterus stretches and the chorion (the external membrane) detaches from it. The well flexed baby’s head fits into the cervix and cuts off the fluid in front of the head (forewaters) from the fluid behind (hind waters). Pressure from contractions cause the forewaters to bulge downwards into the dilating cervix and eventually through into the va**na.
•By the end of pregnancy the baby is surrounded by around 500-1000mls of Fluid. The amniotic fluid is constantly being produced and renewed. Baby swallows the fluid; it is passed through the gut into the baby’s circulation; then sent out via the umbilical cord through the placenta. This process continues even if the amniotic membranes have broken. So, even when the waters have ‘broken’ there is still fluid present ie. there is no such thing as a ‘dry labour’.
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Source:
Midwifethinking.com
Www.Gfmer.ch
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