How can we help?

You can also find more resources in our Help Center.

18 terms

Prenatal Development

STUDY
PLAY
what are the 4 periods of gestation?
germinal/zygote
embryonic
fetal
birth
what develops in the ectoderm?
brain and spinal cord (CNS)
what develops in the mesoderm?
muscles, skeletal system, circulatory system
what develops in the endoderm?
digestive system, lungs, and urinary tract
how long is the embryo in the embryonic period?
one inch
what happens in the germinal period?
fertilized egg travels to uterus
blastocyst implants on wall
placenta begins to form
what happens in the fetal period?
external genitalia begins to form
stimulation of sound and light
begins to feel pain
what is the age of viability?
22-26 weeks
what percent of time is the fetus usually awake?
11-16% of the time
at the end of the fetal period, how long is the fetus and how much will it weight approximately?
18-20 inches long and 6.5-7.5 lbs.
how much does the mother have to be dilated and effaced for expulsion?
10cm dilated and 100% effaced
how many weeks is full term?
40 weeks
what is the final step of birth?
placental birth
what are the two main influences on development during gestation?
genetics and environment
what are the environmental factors that influence gestation?
teratogens
fetal stimulation
mother's behavior
mother's demographics
what are teratogens?
disease or drugs that influence development
what are three demographics of the mother that influence gestation?
age
race
SES
what are influences on development at birth?
medicinal interventions
delivery date
birth weight
childbirth approach