Skip Navigation
The Endowment for Human Development
The Endowment for Human Development
Improving lifelong health one pregnancy at a time.
  • English
Español
Português
Educator Login / Register
Donate Now Get Free Videos

Slideshow: The Heart

The Folding of the Embryo

#34, Slide 3 of 34

3 weeks, 3 days

From The Biology of Prenatal Development.Buy Now

Label Key:

1. base of umbilical cord
2. hindbrain
3. midbrain
4. forebrain
5. site of the future opening of the mouth (called the stomodeum)
6. heart
7. yolk sac
All ages referenced to fertilization, not last menstrual period.
Heart ChambersThe Folding HeartThe Folding of the EmbryoFour-Week EmbryoThe Body Plan EmergesThe Heart in MotionHeart Chambers and LiverHeart in Slow MotionSurrounded by the AmnionHeart and LiverHead and HeartHeart and BrainHead and HeartLiver, Cord, and Left Foot PlateClose-up of Heart and LiverHeart and LiverThe Heart and LiverThe Vital OrgansHand Plate and Vital OrgansLeft Hand Plate and WristThe HeartThe Brain, Heart, and LiverThe Hand in MotionThe Face and TrunkLeft Hand and Vital OrgansThe Beating Heart and LiverThe Liver and Beating HeartThe Heart and BrainThe Four-Chambered HeartThe Hand, Chest, and LiverThe Heart and HandThe Beating HeartThe Heart and ChestClose-up, Seven-Week Heart
Tell your story. Create your own pregnancy calendar.
Help give babies a healthy start and a healthy future. Donate now.