26 Questions
During which period of fetal development does the organogenesis occur?
Embryonic period
At what stage does the mesoderm form according to the text?
Third week of life
What is the approximate weight and height of the fetus during the first month after conception?
400mg and 1 cm
Which layer is the outer layer formed within the first 3 weeks of fetal life?
Ectoderm
At approximately how many days after conception does the outer part of the zygote attach to the uterine wall and the placenta begins to develop?
~10 days
What is the proportion of the head to the entire body during the first month after conception, according to the text?
1/3
During which period is the brain most vulnerable to teratogens?
Embryonic period: 15 - 25 days after conception
What causes the foramen ovale to close within hours after birth?
Increased pulmonary blood flow
When should the ductus arteriosus structurally close after birth?
Within 24 hours
What causes the ductus venosus to immediately close when the umbilical cord is clamped?
Increase in systemic vascular resistance
During which period do newborns seem to move through periods of irregular adjustment in the first 6 hours of life?
Periods of Reactivity
What is assessed during the first 2 hours sensitive period of extrauterine life?
(Color, temperature, heart rate, respiration, activity, ability to respond to stimulation)
What is the purpose of Apgar Scoring?
To assess extrauterine adaptation and rule out abnormalities
What are the characteristics of the embryonic period in terms of vulnerability to teratogens?
$15 - 25$ days after conception: brain is most vulnerable.
Which factor influences the likelihood of anatomical defects due to teratogen exposure during the fetal period?
Intensity & duration of exposure
What causes the legs to be most vulnerable $24-36$ days after conception?
$24 - 36$ days after conception: legs are most vulnerable.
During which period is the fetal brain most susceptible to teratogens?
Embryonic period
At approximately how many days after conception does the foramen ovale close?
Immediately after birth
What causes the legs to be most susceptible to damage during days $24-36$ after conception?
Rapid cell differentiation
What is the proportion of the head to the entire body during the first month after conception?
1:3
What causes the ductus venosus to close immediately when the umbilical cord is clamped?
Postnatal adaptation
During which period is exposure to teratogens more likely to stunt growth rather than cause anatomical defects?
Fetal period
What is the approximate timeframe during which the heart is most vulnerable to teratogens after conception?
20-40 days
Which factor causes the ductus arteriosus to structurally close within 24 hours after birth?
Increased pulmonary blood flow
What causes the foramen ovale to close within hours after birth?
Higher concentrations of oxygen
At approximately how many days after conception does the placenta begin to develop and attach to the uterine wall?
30-40 days
Test your knowledge on the periods of fetal development including pre-embryonic period, embryonic period, and fetal period. Understand the timeline and key events in each stage of fetal growth and differentiation.
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