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: Entire Image Gallery by EHD

Free Blastocyst (without zona)

#57, Slide 37 of 312

6 days

Source: Centro Riproduzione Assistita, Catania, Italy.

Note:

This close-up reveals the absence of the zona and the large size of the blastocyst cavity. The inner cell mass is tiny by comparison.

Label Key:

1. inner cell mass
2. blastocyst cavity
All ages referenced to fertilization, not last menstrual period.
Buy the Biology of Prenatal Development DVD
When does health begin? Find out now.