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

Image Gallery

Four-Cell Human Embryo

48 hours

Four-Cell Human Embryo [Click for next image]
From The Biology of Prenatal Development.Buy Now

Label Key:

1. perivitelline space
2. zona pellucida
3. blastomeres
All ages referenced to fertilization, not last menstrual period.
Two-Cell Embryo
Two-Cell Embryo
Three-Cell Embryo
Three-Cell Embryo
Four-Cell Human Embryo
Four-Cell Human Embryo
Four-Cell Embryo
Four-Cell Embryo
Five-Cell Embryo
Five-Cell Embryo
Six-Cell Embryo
Six-Cell Embryo
Previous Set Previous Picture
Next Set Next Picture
Help give babies a healthy start and a healthy future. Donate now.
Free resources and training for educators