Ultrasound
picture of Ovary: Injections of Lupron, Metrodin, Pergonal or Humegon allow the
ovaries to develop many follicles as seen in this ultrasound immediately prior to egg
retrieval.
Fertilized oocyte (2PN embryo): Immediately after fertilization, the egg
contains two pronuclei. Each contains the chromosomal material from one of the
genetic parents.
Four
cell embryo: Each of the cells is called a blastomere. The embryo is surrounded by a
protein matrix "shell" called the zona pellucida.
Eight
cell embryo: On the third day after the egg retrieval eight cell embryos can be
transfered to the uterus. On average, 10-15% of embryos such as this will implant
after being transfered.
Hatched Embryo: Prior to
implantation, the embryo, now at the blastocyst stage, must hatch out of the zona
pellucida. Only then can it attach to the mother's endometrial lining.
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