EARLY FETAL DEVELOPMENT Flashcards
1
Q
HCG secretion begins around time of implantation of blastocyst
A
within week 1
2
Q
bilaminar disc (epiblast, hypoblast)
A
within week 2, 2 layers
3
Q
gastrulation forms trilaminar embryonic disc
A
within week 3, 3 layers
4
Q
neural tube formed by neuroectoderm and closes by week 4
organogenesis
susceptible to teratogens
A
weeks 3-8 (embryonic period)
5
Q
heart begins to beat
upper and lower limb buds begin to form
4 weeks, 4 limbs and 4 heart chambers
A
week 4
6
Q
fetal cardiac activity by transvaginal ultrasound
A
week 6
7
Q
fetal movements start
gait starts
A
week 8
8
Q
genitalia have male/female characteristics
tenitalia
A
week 10
