Image Gallery
Secondary Oocyte
![Secondary Oocyte [Click for next image]](/images/prenatal_unlabeled_655/secondary-oocyte.jpg "Click for next image")
| Source: Centro Riproduzione Assistita, Catania, Italy. |
Label Key:1. zona pellucida 2. polar body 3. secondary oocyte 4. perivitelline space |
| All ages referenced to fertilization, not last menstrual period. |
Chromosomes and the Nucleus
Sperm
Secondary Oocyte
Single-Cell Embryo
Zygote
Human Zygote
