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The Endowment for Human Development
The Endowment for Human Development
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#438, Slide 15 of 19

4 months

From The Biology of Prenatal Development.Buy Now

Label Key:

1. scalp
2. right shoulder
3. back
4. right elbow
5. right lower leg
6. right thigh
All ages referenced to fertilization, not last menstrual period. One month = 4 weeks.
Fertilization BeginsThree-Cell EmbryoEarly BlastocystImplantation Well UnderwayThe 4-Week EmbryoVitelline Vessels and Yolk SacHand Plate and Vital OrgansHand, 7 Weeks Pregnant7½-Week EmbryoRight Eye and Facial Profile9-Week Fetus, MRI AnimationExit Stage LeftPosterior Surface of Left ThighStill HidingThe MouthFace, 27-Week FetusFace and Left ForearmReady for Birth and Beyond
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