HDF 100 Lecture 3: Lifespan Development - PRENATAL DEVELOPMENT

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LIFESPAN DEVELOPMENT 100
PRENATAL DEVELOPMENT
How long does a pregnancy generally last?
o An average pregnancy generally lasts 266 days, 40 weeks, or 9 months.
How are pregnancies divided?
o Pregnancies are evenly divided into trimesters. Trimesters are a period of three
months, especially as a division of the duration of pregnancy.
o Pregnancy Trimesters:
Germinal
Embryonic
Fetal
1ST TRIMESTER: GERMINAL STAGE
o The germinal stage is the beginning stage of pregnancy which is the first 14 days.
o Starts at conception and ends at implantation
o Conception takes place in the fallopian tube, cell division then begins, and a
blastocyst, or a fluid filled ball of cells, is created.
o At 2 weeks, there are two distinct masses: the outer mass is the placenta and the
inner mass is the embryo.
o Placenta an organ that connects the embryo to the uterine wall by the umbilical
cord. It connects to the mother’s blood vessel, and separates the mother blood and
the baby’s waste. It is NOT a barrier protecting the baby.
o The amniotic sack is what surrounds the embryo/fetus and is filled with amniotic
fluid.
2ND TRIMESTER: EMBRYONIC STAGE
o The embryonic stage is the second stage of pregnancy which lasts from the 3rd to
the 8th week of pregnancy.
o Starts at implantation.
o All basic forms of body structures develop during this stage except sex organs.
o This is when a positive at home pregnancy test can be received.
o Pregnancy symptoms begin: One may feel pregnant and look a bit green.
o The developmental sequence begins. The sequence moves from cephalocaudal
and proximodistal.
o Cephalocaudal development from head to toe.
o Proximosdital from the center to the extremities.
3RD TRIMESTER FETAL PERIOD
o The third and final stage of pregnancy is the fetal period which begins at 8 weeks.
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