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Fetal Development Stages
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Fetal Development Stages

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@VeritableJadeite

Questions and Answers

At what stage can the sex of the fetus typically be determined through external examination?

  • 11 weeks
  • 12 weeks
  • 20 weeks
  • 6 weeks (correct)

    • What happens to the intestinal loops during the fetal development between the sixth and twelfth weeks?

  • They are fully developed and function normally.
  • They begin to form the digestive system.
  • They permanently remain in the umbilical cord.
  • They cause herniation and then retract into the abdominal cavity. (correct)

    • Which of the following statements about the limbs of the fetus is accurate?

  • Upper limbs reach their relative length earlier than lower limbs. (correct)
  • There is no difference in the development of limbs.
  • Limbs start developing after the third month.
  • Lower limbs are longer and more developed than upper limbs.

    • What is the expected weight of a full-term fetus at 37-38 weeks?

    <p>3,000 g (3 kg)</p> Signup and view all the answers

    At approximately what length should a fetus be around 20 weeks?

    <p>20 cm</p> Signup and view all the answers

    Why should ranitidine be avoided during organogenesis?

    <p>It can alter the sex of the fetus.</p> Signup and view all the answers

    What is a notable feature of an 18-week fetus connected to the placenta?

    <p>The umbilical cord shows swelling due to herniated loops.</p> Signup and view all the answers

    What is the age threshold at which a fetus is considered viable?

    <p>20 weeks</p> Signup and view all the answers

    At which stage of gestation is the fetal respiratory system not yet fully differentiated?

    <p>End of the sixth month</p> Signup and view all the answers

    What is the approximate weight of a fetus at 6.5 to 7 months of gestation?

    <p>1,100 g</p> Signup and view all the answers

    What characteristic is noted about a fetus born early in the sixth month?

    <p>Struggles to survive due to underdeveloped systems</p> Signup and view all the answers

    During which months do fetal movements become noticeable to the mother?

    <p>Fourth and fifth month</p> Signup and view all the answers

    What is the approximate crown-rump length (CRL) of a fetus at the end of the first half of intrauterine life?

    <p>15 cm</p> Signup and view all the answers

    At the beginning of the third month, how does the size of the head compare to the Crown-Rump Length (CRL)?

    <p>The head constitutes approximately half of the CRL.</p> Signup and view all the answers

    What is the correlation between the growth of the head and the body during the fetal period?

    <p>The body grows faster than the head as gestation progresses.</p> Signup and view all the answers

    During which months is growth in length of the fetus particularly striking?

    <p>3rd, 4th, and 5th months</p> Signup and view all the answers

    What is the relationship between the Crown-Height Length (CHL) and head size at birth?

    <p>The head is approximately one-quarter of the CHL at birth.</p> Signup and view all the answers

    How is the length of the fetus commonly indicated?

    <p>Crown-Rump Length (CRL) and Crown-Heel Length (CHL)</p> Signup and view all the answers

    When does weight increase most strikingly during gestation?

    <p>During the last two months</p> Signup and view all the answers

    What is the length considered for a normal pregnancy duration?

    <p>280 days or 40 weeks</p> Signup and view all the answers

    Which measurement indicates the standing height of the fetus?

    <p>Crown-Heel Length (CHL)</p> Signup and view all the answers

    What is the purpose of adding 7 days, subtracting 3 months, and adding 1 year when calculating the age of gestation?

    <p>To compute the gestational age based on the last menstrual period.</p> Signup and view all the answers

    At what stage can the sex of the fetus typically be determined through external examination?

    <p>By the end of the third month.</p> Signup and view all the answers

    Which of the following statements accurately describes the visible features of the fetus during the third month?

    <p>The blood vessels are noticeable due to the skin's thinness.</p> Signup and view all the answers

    What important developmental milestone occurs by the 12th week of gestation?

    <p>Primary ossification centers appear in the long bones.</p> Signup and view all the answers

    Which statement best describes the positioning of the eyes during the third month of gestation?

    <p>The eyes are positioned laterally but will move towards the center.</p> Signup and view all the answers

    What is the significance of the chorion frondosum and chorion laeve during gestation?

    <p>Chorion frondosum contains villi that facilitate nutrient exchange, while chorion laeve is smooth and less involved.</p> Signup and view all the answers

    Which specific physical transformation happens to the face of the fetus by the third month?

    <p>The facial features become distinctly human-like.</p> Signup and view all the answers

    When does the process of ossification in the long bones and skull typically begin?

    <p>By the end of the second month.</p> Signup and view all the answers

    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.

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