File talk:Stage3 bf02.jpg

From Embryology

107 cells, Carnegie No. 8663.

  • Described by Hertig et al. (1954). Uterine.
  • No zona pellucida (fig. 8). Diameter, 153 x 115 μm (103 x 80 after fixation; 91.6 x 83.3 after section- ing); diameters of blastomeres varied from 8 to 21.
  • Large blastocystic cavity (58 μm). Embryonic mass composed of 8 cells: epiblastic, hypoblastic, and a presumed primordial germ cell (Hertig, 1968).
  • Believed to be about 41⁄2 days old. Khvatov (1967), without further elaboration, claimed: “according to photographs, should be of the male sex.” Smith (1970, fig. 15), without further justification, claimed that a cytoplasmic vauole was “the first indication toward an amniotic space.”

The raw data, which will be copy right free, may be made available to all legitimate researchers and students. We will acknowledge the generation of the images in any distributed form and request that the user do so as well.