What is the stage of blastocyst implantation in the endometrium?
Understand the Problem
The question refers to the stage of blastocyst implantation in the endometrium. This involves understanding the specific processes and timing during which the blastocyst adheres to and embeds itself within the uterine lining (endometrium) during early pregnancy.
Answer
The stages of blastocyst implantation in the endometrium are apposition (contact), adhesion (attachment), and invasion.
Blastocyst implantation in the endometrium consists of three stages: apposition (contact), adhesion (attachment), and invasion. During apposition, the blastocyst makes initial contact with the endometrium. Adhesion involves the blastocyst's trophoblast cells attaching to the endometrial epithelium. Finally, invasion occurs when trophoblast cells penetrate the endometrial epithelial basement membrane.
Answer for screen readers
Blastocyst implantation in the endometrium consists of three stages: apposition (contact), adhesion (attachment), and invasion. During apposition, the blastocyst makes initial contact with the endometrium. Adhesion involves the blastocyst's trophoblast cells attaching to the endometrial epithelium. Finally, invasion occurs when trophoblast cells penetrate the endometrial epithelial basement membrane.
More Information
Implantation typically occurs about 6 days after fertilization. The blastocyst must hatch from its zona pellucida before implantation can begin.
Tips
A common mistake is to only consider one aspect of implantation, such as just the attachment or invasion phase, without recognizing the complete sequence.
Sources
- Molecular Signaling Regulating Endometrium–Blastocyst Crosstalk - pmc.ncbi.nlm.nih.gov
- Implantation consists of three stages - pmc.ncbi.nlm.nih.gov
- Embryo Implantation Process Steps & their stages - Reviva IVF - revivaivf.com
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