Podcast
Questions and Answers
At what stage can the sex of the fetus typically be determined through external examination?
At what stage can the sex of the fetus typically be determined through external examination?
What happens to the intestinal loops during the fetal development between the sixth and twelfth weeks?
What happens to the intestinal loops during the fetal development between the sixth and twelfth weeks?
Which of the following statements about the limbs of the fetus is accurate?
Which of the following statements about the limbs of the fetus is accurate?
What is the expected weight of a full-term fetus at 37-38 weeks?
What is the expected weight of a full-term fetus at 37-38 weeks?
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At approximately what length should a fetus be around 20 weeks?
At approximately what length should a fetus be around 20 weeks?
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Why should ranitidine be avoided during organogenesis?
Why should ranitidine be avoided during organogenesis?
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What is a notable feature of an 18-week fetus connected to the placenta?
What is a notable feature of an 18-week fetus connected to the placenta?
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What is the age threshold at which a fetus is considered viable?
What is the age threshold at which a fetus is considered viable?
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At which stage of gestation is the fetal respiratory system not yet fully differentiated?
At which stage of gestation is the fetal respiratory system not yet fully differentiated?
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What is the approximate weight of a fetus at 6.5 to 7 months of gestation?
What is the approximate weight of a fetus at 6.5 to 7 months of gestation?
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What characteristic is noted about a fetus born early in the sixth month?
What characteristic is noted about a fetus born early in the sixth month?
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During which months do fetal movements become noticeable to the mother?
During which months do fetal movements become noticeable to the mother?
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What is the approximate crown-rump length (CRL) of a fetus at the end of the first half of intrauterine life?
What is the approximate crown-rump length (CRL) of a fetus at the end of the first half of intrauterine life?
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At the beginning of the third month, how does the size of the head compare to the Crown-Rump Length (CRL)?
At the beginning of the third month, how does the size of the head compare to the Crown-Rump Length (CRL)?
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What is the correlation between the growth of the head and the body during the fetal period?
What is the correlation between the growth of the head and the body during the fetal period?
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During which months is growth in length of the fetus particularly striking?
During which months is growth in length of the fetus particularly striking?
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What is the relationship between the Crown-Height Length (CHL) and head size at birth?
What is the relationship between the Crown-Height Length (CHL) and head size at birth?
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How is the length of the fetus commonly indicated?
How is the length of the fetus commonly indicated?
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When does weight increase most strikingly during gestation?
When does weight increase most strikingly during gestation?
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What is the length considered for a normal pregnancy duration?
What is the length considered for a normal pregnancy duration?
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Which measurement indicates the standing height of the fetus?
Which measurement indicates the standing height of the fetus?
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What is the purpose of adding 7 days, subtracting 3 months, and adding 1 year when calculating the age of gestation?
What is the purpose of adding 7 days, subtracting 3 months, and adding 1 year when calculating the age of gestation?
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At what stage can the sex of the fetus typically be determined through external examination?
At what stage can the sex of the fetus typically be determined through external examination?
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Which of the following statements accurately describes the visible features of the fetus during the third month?
Which of the following statements accurately describes the visible features of the fetus during the third month?
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What important developmental milestone occurs by the 12th week of gestation?
What important developmental milestone occurs by the 12th week of gestation?
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Which statement best describes the positioning of the eyes during the third month of gestation?
Which statement best describes the positioning of the eyes during the third month of gestation?
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What is the significance of the chorion frondosum and chorion laeve during gestation?
What is the significance of the chorion frondosum and chorion laeve during gestation?
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Which specific physical transformation happens to the face of the fetus by the third month?
Which specific physical transformation happens to the face of the fetus by the third month?
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When does the process of ossification in the long bones and skull typically begin?
When does the process of ossification in the long bones and skull typically begin?
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Study Notes
Fetal Development
- Fetal period spans from the 9th week until birth, involving maturation of tissues, organs, and rapid body growth.
- Measurement of fetal length is key; two primary scales are:
- Crown-Rump Length (CRL): Measurement from the crown to the rump.
- Crown-Heel Length (CHL): Measurement from the crown to the heel.
- Full-term pregnancy lasts about 280 days (40 weeks) or 266 days (38 weeks) post-fertilization.
Monthly Changes in Fetal Development
- In the 3rd month, ossification centers appear in long bones and skull; external genitalia begins to develop, enabling sex determination.
- By the end of the 3rd month, fetal facial structure resembles a human, with the eyes moving from lateral to a more forward position.
- 4th and 5th months witness rapid lengthening of the fetus; lanugo hair develops, and fetal movements become detectable by the mother.
- In the 6th month, the respiratory system and central nervous system lack full differentiation; survival chances remain low for fetuses born prematurely.
Head and Body Growth
- At the start of the 3rd month, the head constitutes about 50% of CRL; by the 5th month, it reduces to 33%, and at birth, it is about 25% of CHL.
- Growth rate of the body accelerates over time, while head growth decelerates.
Weight Changes
- Significant length growth occurs during the 3rd to 5th months.
- Weight gain is most pronounced in the last two months of gestation.
Viability and Common Measurements
- A fetus is considered viable at around 20 weeks, averaging 20 cm in length and 500 g in weight.
- Full-term fetus typically measures 35-36 cm and weighs approximately 3,000 g (3 kg).
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Description
Explore the different stages of fetal development with a focus on head size relative to the crown-rump length (CRL) and crown-heel length (CHL). This quiz covers the crucial changes occurring during the first five months of gestation, emphasizing monthly growth patterns. Test your knowledge on the developmental milestones of the fetus.
