Skip Navigation
The Endowment for Human Development
The Endowment for Human Development
Improving lifelong health one pregnancy at a time.
Donate Now Get Free Videos

Slideshow: Early Events

Hatched Blastocyst

#55, Slide 19 of 24

5 days

Source: Centro Riproduzione Assistita, Catania, Italy.

Note:

With the escape from the zona complete, the embryo is free to implant.

Label Key:

1. embryo at the blastocyst stage
2. shell of discarded zona pellucida
All ages referenced to fertilization, not last menstrual period.
Free resources and training for educators
Tell your story. Create your own pregnancy calendar.