Amniotic sac

Amniotic sac

The amniotic sac is the sac in which the fetus develops.

Some sources consider it to be equivalent to the amnion..

When in the light, the amniotic sac is shiny and very smooth, but too tough to pierce through.


An artificial rupture of membranes (ARM), also known as an amniotomy, may be performed by a midwife or obstetrician. This is usually performed using an amnihook and is intended to induce or accelerate labour.


The presence of the amnion identifies humans and other mammals as amniotes, along with reptiles, dinosaurs, birds but not amphibians nor fish.

Amniotic fluid

Amniotic fluid is the watery liquid surrounding and cushioning a growing fetus within the amnion. It allows the fetus to move freely without the walls of the uterus being too tight against its body. Buoyancy is also provided.

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