18 Questions
What is the function of the glycoprotein found on the surface of blastomeres?
Involved in compaction
What is the term for the inner cell mass after blastocyst formation?
Embryoblast
What must degenerate for implantation to occur?
Zona pellucida
Where does the blastocyst usually implant within the uterus?
Posterior superior wall
At what stage of the menstrual cycle does implantation occur?
Progestational phase
What is the most common site of an ectopic pregnancy?
Ampulla of the uterine tube
What happens to the secondary oocyte if fertilization does not occur?
It degenerates
In which layer of the endometrium does the blastocyst implant?
Functional layer
What is the purpose of the basal layer of the endometrium?
To serve as the source of regeneration of the functional layer
What is the result of the series of mitotic divisions during cleavage?
The decrease in size of individual blastomeres
Why must the zona pellucida degenerate for implantation to occur?
To prevent the embryo from implanting in the uterine tube
What is the origin of the mitochondrial DNA in human adult cells?
Maternal origin only
At which stage of development is the lacunar network formed?
Day 13 blastocyst
What is the term for the type of implantation where the blastocyst is completely implanted within the endometrium?
Interstitial implantation
What is the name of the cavity that forms in the extraembryonic mesoderm and coalesces to form the extraembryonic coelom?
Extraembryonic spaces
What is the term for the thin echogenic line observed in the sonogram at about week 3?
Embryonic disk
What is the term for the process by which the embryoblast receives maternal nutrients?
Diffusion
What is the term for the structure that forms the connection between the embryo and the trophoblast?
Connecting stalk
Learn about the formation of blastocysts, including the role of uvomorulin, fluid secretion, and the development of the embryoblast and trophoblast. Understand the process of zona pellucida degeneration and its significance in embryonic development.
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