True scale, in micrometers (µm). The floor grid is 10 µm squares.
| Oocyte, cell body | ~110 µm |
| Oocyte with zona pellucida | ~150 µm |
| Zona pellucida wall | ~15 µm |
| Polar body | ~13 µm |
| Human hair, typical width | ~70 µm |
| Hair width range | 17–181 µm |
| Sperm, head to tail | ~55 µm |