Avsnitt 16 Flashcards
What is embryonic genome activation (EGA)?
EGA is the degradation of maternal mRNAs and proteins and the initiation of expressing genes of the embryos.
When does embryonic genome activation (EGA) occur?
EGA occurs during the late one cell/early two-cell stages.
Why is EGA important for the pre-implantation development of the zygote?
EGA is an essential event for early embryonic development. It is important for the continuous development of the embryos. If EGA fails, the embryonic development will be arrested.
When does the oocyte give out the 2nd polar body?
When fertilization happens.
In the 2nd week of embryonic development, the bilaminar germ disc (the embryo itself) contains the following structure:
Epiblast and hypoblast
Neural tube formation is finished at____ of the embryonic development.
The 4th week
What structure in the early embryo defines the left and right sides of the embryo?
Primitive streak
E-cadherin is an adhesion molecule. In theory, if this molecule is disturbed, what will happen to the neural tube formation?
There will be defects in neural tube formation as adhesion molecules are needed.
Sammanfatta vad som utmärker första veckans embryoutveckling.
Cellerna blir fler och mindre. Blastocysten växer fast i livmoderslemhinnan.
Sammanfatta vad som utmärker andra veckans embryoutveckling.
Uppdelning i två lager. Extraembryonalt mesoderm bildas. Tre håligheter bildas. Syre- och näringsförsörjning säkerställs.
Sammanfatta vad som utmärker tredje veckans embryoutveckling.
Tre groddblad bildas och riktningskoordinater slås fast (gastrulabildning).
Where does fertlization occur?
In the oviduct (fallopian tube).
During early embryonic development, when does the neural tube closure take place?
Week 3-4.
What structure controls the right and left differentiation of the embryonic development?
The primitive streak
It is common practice to prevent meningocele from happening by giving a substance to pregnant women. What is it?
Folic acid
