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The Endowment for Human Development
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Amniotic Fluid


4 weeks, 4 days

From The Biology of Prenatal Development.Buy Now

Script: By 4 weeks the clear amnion surrounds the embryo in a fluid-filled sac. This sterile liquid, called amniotic fluid, provides the embryo with protection from injury.

All ages referenced to fertilization, not last menstrual period.
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2 Comments


Shelly Golden Gettings
February 5, 2013 at 3:50 pm
Shelly Golden Gettings
According to the website, all ages are referenced to fertilization not last menstrual period.
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atucny
May 8, 2012 at 10:25 am
atucny
I can not figure out if these videos are based on gestational age or actual age. Can anyone help me on this?
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