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. 2016 Jan 8;10(1-2):88–110. doi: 10.1080/19336918.2015.1120397

Figure 2.

Figure 2.

Rat placental development. (A) Blastocyst (5° dg). (B) Implantation phase (6.5° dg). Trophectoderm differentiation and primary trophoblast giant cell infiltration of the endometrium. (C) Post-implantation phase (7.5° dg). Trophectoderm differentiation with the formation of giant cells around the embryo and ectoplacental cone. (D) Post-implantation phase (8.5° dg). Allantois formation from the posterior epiblast. (E) Pre-placental phase (10.5° dg). Placental labyrinth formation from the fusion of the allantoid mesoderm with the chorionic ectoderm. (F) Definite placenta (15° dg). Evidence of the trophoblast giant cell layer, spongiotrophoblast and placental labyrinth. dg = days of gestation.