Multiple Pregnancy and Gestation
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Questions and Answers

What is the term used to describe a pregnancy where the uterus contains more than one baby?

  • Multiple gestation (correct)
  • Single fetus development
  • Twin uterine pregnancy
  • Singleton pregnancy
  • What is the term for babies in the uterus?

  • Foetuses
  • Embryos
  • Neonates
  • Fetuses (correct)
  • How many fetuses are present in a multiple pregnancy?

  • Exactly two
  • One or two
  • Less than three
  • More than one (correct)
  • What is the alternative spelling of the term 'fetus'?

    <p>Foetus</p> Signup and view all the answers

    What is the unit of measurement for the number of fetuses in a multiple pregnancy?

    <p>M</p> Signup and view all the answers

    What is the percentage of twin gestation that occurs due to monozygotic twining?

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

    What is the term used to describe monozygotic twins?

    <p>Uni-ovular twins</p> Signup and view all the answers

    What is the result of one ovum being fertilized by one spermatozoon in monozygotic twining?

    <p>One embryo that splits into two</p> Signup and view all the answers

    What is the characteristic of monozygotic twins in terms of their sex?

    <p>They are always the same sex</p> Signup and view all the answers

    What is the term used to describe the fertilization of one ovum by one spermatozoon?

    <p>Monozygotic fertilization</p> Signup and view all the answers

    What is the primary characteristic that distinguishes Dizygotic twin gestation from Monozygotic twin gestation?

    <p>Fertilization of two separate eggs</p> Signup and view all the answers

    Which type of twin gestation is more likely to result in identical twins?

    <p>Monozygotic twin gestation</p> Signup and view all the answers

    What is the primary reason why Dizygotic twins are more common than Monozygotic twins?

    <p>The fertilization of two separate eggs is more likely to occur naturally</p> Signup and view all the answers

    What is the difference in the number of placentas and amniotic sacs between Dizygotic and Monozygotic twins?

    <p>Dizygotic twins have two placentas and two amniotic sacs, while Monozygotic twins have one placenta and one amniotic sac</p> Signup and view all the answers

    What is the biological explanation for why Dizygotic twins are more likely to be fraternal?

    <p>Dizygotic twins are formed from two separate eggs, resulting in different genetic makeup</p> Signup and view all the answers

    What is the primary factor that determines the type of placentation in monozygotic twining?

    <p>The timing of zygote division after fertilization</p> Signup and view all the answers

    Which type of placentation is characterized by a single chorion and a single amnion?

    <p>Monochorionic and monoamniotic (MCMA)</p> Signup and view all the answers

    What is the difference between monochorionic and diamniotic (MCDA) and monochorionic and monoamniotic (MCMA) placentation?

    <p>The number of amnions</p> Signup and view all the answers

    Which type of placentation is characterized by two separate chorions and two separate amnions?

    <p>Dichorionic and diamniotic (DCDA)</p> Signup and view all the answers

    What is the relationship between the timing of zygote division and the type of placentation in monozygotic twining?

    <p>Later division leads to MCMA placentation</p> Signup and view all the answers

    What is the type of placentation when the division of the zygote occurs within three days after fertilization?

    <p>Dichorionic diamniotic</p> Signup and view all the answers

    At what stage of development do conjoined twins most likely form?

    <p>After 13 days after fertilization</p> Signup and view all the answers

    What is the type of placentation when the division of the zygote occurs between 8 and 13 days after fertilization?

    <p>Monochorionic and monoamniotic</p> Signup and view all the answers

    Between what days after fertilization does the division of the zygote result in monochorionic and diamniotic twins?

    <p>Between 3 and 8 days</p> Signup and view all the answers

    What is the type of placentation when the division of the zygote occurs between 3 and 8 days after fertilization?

    <p>Monochorionic and diamniotic</p> Signup and view all the answers

    Study Notes

    Placentation and Monozygotic Twins

    • Monozygotic twinning occurs when one ovum fertilized by one spermatozoon divides into two embryos, resulting in identical twins.
    • Placentation type depends on the timing of zygote division after fertilization.
    • Division within three days post-fertilization leads to dichorionic and diamniotic (DCDA) placentation.
    • Division between days three and eight results in monochorionic and diamniotic (MCDA) placentation.
    • Division occurring between days eight and thirteen results in monochorionic and monoamniotic (MCMA) placentation.
    • If division occurs after thirteen days, conjoined (Siamese) twins are likely to form.

    Multiple Pregnancy

    • Defined as a pregnancy where the uterus contains more than one fetus simultaneously.
    • The term "fetuses" refers to babies in utero.
    • Twin gestation can be classified into two types:
      • Monozygotic twin gestation (identical twins).
      • Dizygotic twin gestation (fraternal twins).

    Characteristics of Monozygotic Twins

    • Monozygotic twins are always the same sex due to originating from a single fertilized ovum.
    • Occur in approximately 20% of twin gestations.

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    Description

    Test your knowledge about multiple pregnancy, a condition where a woman carries more than one fetus simultaneously. Learn about the definition, causes, and complications of multiple pregnancy. This quiz is perfect for medical students and professionals.

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