File talk:Stage3 bf01.jpg
From Embryology
58 cells, Carnegie No. 8794.
- Described by Hertig et al. (1954).
- Uterine. Diameter, 230 x 190 μm (108 X 86 after fixation; 101 x 73.3 after sectioning); diameters of blastomeres varied from 15 to 23 after sectioning; polar bodies, 18 μm after fixation.
- Zona pellucida intact while fresh but partly deficient after fixation (fig. 3-2).
- Two polar bodies. Early blastocystic cavity. Believed to be about 4 days old.
