Slideshow: Early Events
Nine-Cell Embryo
#48, Slide 11 of 24
57 hours
| Source: Centro Riproduzione Assistita, Catania, Italy. |
Note:It is becoming more difficult to count the number of cells as more of them are out of focus when looking through the microscope.Note:The zona pellucida is appearing relatively thinner with time.Label Key:1. zona pellucida 2. perivitelline space |
| All ages referenced to fertilization, not last menstrual period. |
