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Questions and Answers
What is the term used to describe a pregnancy where the uterus contains more than one baby?
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?
What is the term for babies in the uterus?
- Foetuses
- Embryos
- Neonates
- Fetuses (correct)
How many fetuses are present in a multiple pregnancy?
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'?
What is the alternative spelling of the term 'fetus'?
What is the unit of measurement for the number of fetuses in a multiple pregnancy?
What is the unit of measurement for the number of fetuses in a multiple pregnancy?
What is the percentage of twin gestation that occurs due to monozygotic twining?
What is the percentage of twin gestation that occurs due to monozygotic twining?
What is the term used to describe monozygotic twins?
What is the term used to describe monozygotic twins?
What is the result of one ovum being fertilized by one spermatozoon in monozygotic twining?
What is the result of one ovum being fertilized by one spermatozoon in monozygotic twining?
What is the characteristic of monozygotic twins in terms of their sex?
What is the characteristic of monozygotic twins in terms of their sex?
What is the term used to describe the fertilization of one ovum by one spermatozoon?
What is the term used to describe the fertilization of one ovum by one spermatozoon?
What is the primary characteristic that distinguishes Dizygotic twin gestation from Monozygotic twin gestation?
What is the primary characteristic that distinguishes Dizygotic twin gestation from Monozygotic twin gestation?
Which type of twin gestation is more likely to result in identical twins?
Which type of twin gestation is more likely to result in identical twins?
What is the primary reason why Dizygotic twins are more common than Monozygotic twins?
What is the primary reason why Dizygotic twins are more common than Monozygotic twins?
What is the difference in the number of placentas and amniotic sacs between Dizygotic and Monozygotic twins?
What is the difference in the number of placentas and amniotic sacs between Dizygotic and Monozygotic twins?
What is the biological explanation for why Dizygotic twins are more likely to be fraternal?
What is the biological explanation for why Dizygotic twins are more likely to be fraternal?
What is the primary factor that determines the type of placentation in monozygotic twining?
What is the primary factor that determines the type of placentation in monozygotic twining?
Which type of placentation is characterized by a single chorion and a single amnion?
Which type of placentation is characterized by a single chorion and a single amnion?
What is the difference between monochorionic and diamniotic (MCDA) and monochorionic and monoamniotic (MCMA) placentation?
What is the difference between monochorionic and diamniotic (MCDA) and monochorionic and monoamniotic (MCMA) placentation?
Which type of placentation is characterized by two separate chorions and two separate amnions?
Which type of placentation is characterized by two separate chorions and two separate amnions?
What is the relationship between the timing of zygote division and the type of placentation in monozygotic twining?
What is the relationship between the timing of zygote division and the type of placentation in monozygotic twining?
What is the type of placentation when the division of the zygote occurs within three days after fertilization?
What is the type of placentation when the division of the zygote occurs within three days after fertilization?
At what stage of development do conjoined twins most likely form?
At what stage of development do conjoined twins most likely form?
What is the type of placentation when the division of the zygote occurs between 8 and 13 days after fertilization?
What is the type of placentation when the division of the zygote occurs between 8 and 13 days after fertilization?
Between what days after fertilization does the division of the zygote result in monochorionic and diamniotic twins?
Between what days after fertilization does the division of the zygote result in monochorionic and diamniotic twins?
What is the type of placentation when the division of the zygote occurs between 3 and 8 days after fertilization?
What is the type of placentation when the division of the zygote occurs between 3 and 8 days after fertilization?
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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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