Human development III Flashcards
exam 2 (41 cards)
in males the 20-week embryo until puberty, they have i
immature spermatogonia
primary oocytes are arrested in
prophase of meiosis I
in puberty primary oocytes can now develop into secondary oocytes and arrested in
metaphase of meiosis II
Day 1-17
early embryonic development
the three germ layers of the embryo are formed during the
third week of gastrulation
when is implantation completed?
end of the second week after fertilization
when is the bilaminer embryonic disc formed?
in implantation
when is the late blastocyst is formed
day 12-14
The zygote cleaves into _____ for 2-3 days without any ______ in overall size due to the presence of the ______
The zygote cleaves into blastomeres for 2-3 days without any increase in overall size due to the presence of the zona pellucida
About day 3-4, it forms a _____ that consists of outer cells that form the ______ and _______
About day 3-4, it forms a morula that consists of outer cells that form the trophoblast and inner cell mass
when is the late blastocyst formed?
during days 12-14, about a week after beginning of implantation at day 6-7
Day:
eureka moment- membrane fusion/ICSI
-1
Day:
fertilization complete- pronuclei fuse
0
Day:
2-cell embryo- first embryonic cleavage
1
Day:
4-cell embryo
2
Day:
8- cell embryo
2.5- 3
Day:
Morula- compaction
3-4
Day:
Blastocyst- implantation period
5-14
Day:
Gastrula
15-17
Further cleavages form the ________ at day 4-5 and causes shedding of the _____ within a day or two. This permits the embryo to begin the implantation process
Further cleavages form the early blastocyst at day 4-5 and causes shedding of the Zona Pellucida within a day or two. This permits the embryo to begin the implantation process
shedding of the zona pellucida
hatching
blastococel forms
to break the zona pellucida
blastocyst cavity
blastocel
benefits of PGD testing of blastocyst vs blastomeres?
blastomere you can only remove 2 while in blastocyst you can remove multiple
