Embryology Flashcards
Average Fetal age from conception to birth
38 weeks
Average Gestational age from conception to birth
40 weeks
During what period are all major organs formed?
embryonic (first 8 weeks)
During what period do all organs grow larger and become more complex?
fetal (last 30 weeks)
egg released into the peritoneal cavity
ovulation
occurs as egg travels down fallopian tube and meets sperm
fertilization
the cell that forms when the ova and sperm fuse
zygote
begins immediately as the zygote travels down the fallopian tube & into the uterus
cell division
the solid cluster of 12-16 blastomeres at about 72 hours
morula
On day 4 post conception, what does the 60 cell morula become when it enters the uterus and takes up fluid?
blastocyst
type of cell in blastocyst stage that forms the embryo
inner cell mass
layer of cells surrounding the cavity which helps form the placenta
trophoblast
What happens if inner cell mass of a single blastocyst divides?
monozygotic (identical) twins
two fluid filled sacs in the inner cell mass
Amniotic sac from epiblast
Yolk sac from hypoblast
will become the serous cavities of the ventral body cavity
coelem
