Slideshow: Early Events
Morula: Twelve-Cell Embryo
#50, Slide 13 of 24
60 hours
| Source: Centro Riproduzione Assistita, Catania, Italy. |
Note:This 12-cell embryo is now at the earliest stage at which the embryo can be called a "morula," which is the scientific word used to describe a ball of cells. This term will continue to apply until a cavity begins to form inside this spherically shaped clump of cells. The age is approximate.Label Key:1. zona pellucida 2. perivitelline space |
| All ages referenced to fertilization, not last menstrual period. |
