Module 1 - Person & FCC Flashcards
First trimester of pregnancy = ____ phase
embyronic
2nd + 3rd trimesters = ______ phase
foetal
embryonic tissues form 3 layers when?
first 3 weeks of pregnancy
3 layers of embryonic tissues
ectoderm, mesoderm, endoderm
ectoderm
outer layer, 2nd week, forms basic structure
mesoderm
middle layer, 3rd week, forms organs and systems
endoderm
inner layer, 2nd week
during the first 3 weeks of pregnancy, the foetal membranes differentiate into:
chorion and amnion
chorion
precursor to placenta
amnion
precursor to amniotic sac
the “foetal phase” is characterised as
rapid growth in the size of the foetus
at around what week of pregnancy does the foetus look most like a baby?
26 weeks
what is the vernix caseosa?
thick white substance covering the baby’s hair and skin
how thick is the vernix caseosa by birth?
0.3cm
lanugo
fine hair covering the baby