Anatomy study note · Pregnancy
Amnion
The thin fetal membrane forming the wall of the amniotic cavity, which holds the fetus in amniotic fluid. It covers the umbilical cord and lines the fetal surface of the placenta.
Key points
- Amnion + chorion = amniochorionic membrane ("bag of waters").
- Fluid ~1 L at term; replaced every 3 h.
- Hydramnios → oesophageal atresia; oligamnios → renal agenesis.
The full note in the atlas also covers
Features · Development · Clinical notes
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Written from
- Inderbir Singh’s Human Embryology, ch. 6, PDF pp. 88–91
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