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Phases in embryo implantation
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Phases in embryo implantation

Embryo implantation is the process by which a blastocyst-stage embryo attaches to the endometrium, which is the inner wall of the uterus. It consists of 4 main stages:

  • First, the embryo is detached from the zona pellucida, leaving only the trofoectoderm (purple cells in the image) and the internal cell mass (blue color in the image).
  • It is then positioned in the endometrial epithelium, with the embryonic pole (where the internal cell mass is) towards the endometrium.
  • Subsequently, the trofoectoderm and endometrial epithelium are joined by adhesion molecules and pinopods, which are extensions of the endometrium that attract the blastocyst.
  • Finally, invasion occurs, after which the blastocyst is embedded in the endometrial stroma.
Read the full article on: ( 46).
By (embryologist) and (babygest staff).
Last Update: 09/25/2019
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