Embryology and Pregnancy Development Quiz

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29 Questions

What is the expected duration of a normal pregnancy in days post-fertilization?

266 days

When is a baby considered premature?

Before 37 weeks

Where does fertilization normally take place?

In the fallopian tube

What is the significance of an ectopic pregnancy?

It is a potentially life-threatening condition

What are the names and time frames for the three developmental periods?

Germinal, embryonic, fetal; 0-2 weeks, 3-8 weeks, 9 weeks-birth

What male and female structures meet to start the process of fertilization?

Sperm and secondary oocyte in the ampulla of the fallopian tube

What are the key events that take place during weeks 1 and 2 of development?

Fertilization, cleavage, blastocyst formation

What is the morphological appearance and events taking place as the zygote travels down the uterine tube?

Morula, blastocyst formation, implantation

What is the term for the formation of lacuna spaces and the start of placental development?

Trophoblast proliferation

What is the term for the process of recognizing the terminology used in embryology?

Embryological terminology

At what point is pregnancy considered premature?

Before 37 weeks from fertilization

Where does implantation of the blastocyst occur?

On the posterior superior wall of the uterus

What is the main cause of maternal death during the first trimester?

Ectopic pregnancy

When does pregnancy become overdue or post-term?

When the baby has not been born by 40 weeks from the last menstrual period

What is the duration of the menstrual cycle considered to be?

28 days

What is the term for when the fertilized egg grows outside the uterus?

Ectopic pregnancy

How long does pregnancy last from fertilization?

266 days

What marks the beginning of pregnancy?

Fertilization of the egg by the sperm

How is a woman's due date calculated?

280 days (40 weeks) from the onset of the last menstrual period

What is the first warning sign of an ectopic pregnancy?

Light vaginal bleeding and pain

What is the treatment for an early ectopic pregnancy without unstable bleeding?

Methotrexate

What is the function of the amnion?

To surround the entire embryo as a protective membrane

What is the result of the syncytiotrophoblast penetrating deep into the uterine wall?

Establishment of uteroplacental circulation

When does implantation become complete?

End of week 2

What is the function of the hypoblast in the bilaminar germ disc?

Thickening in the future head region

What is the role of the cytotrophoblast in uteroplacental circulation?

Formation of primary villi

What is the function of the fibrin plug in the uterine endometrium?

To close the defect after implantation

What is the role of the extraembryonic mesoderm in the chorionic cavity?

Formation of the extraembryonic cavity

What is the significance of the prechordal/oropharyngeal plate?

Formation of the oropharyngeal membrane

Study Notes

Embryology and Pregnancy Development Summary

  • Embryology is the study of development from fertilization to birth
  • Pregnancy lasts about 266 days or 38 weeks from fertilization
  • Prematurity is defined as birth before 37 weeks from the last menstrual period
  • Overdue or post-term occurs when the baby has not been born by 40 weeks from the last menstrual period
  • Pregnancy is divided into germinal, embryonic, and fetal periods
  • Pregnancy begins with fertilization of the egg by the sperm, forming a zygote
  • Cleavage of the zygote leads to the formation of a blastocyst
  • Implantation of the blastocyst occurs on the posterior superior wall of the uterus
  • Ectopic pregnancy, occurring in about 2% of all pregnancies, is when the fertilized egg grows outside the uterus
  • Ectopic pregnancy is the main cause of maternal death during the first trimester
  • The menstrual cycle is considered to be 28 days in duration, with ovulation occurring around day 14
  • A woman's due date is calculated as 280 days (40 weeks) from the onset of the last menstrual period

Test your knowledge of embryology and pregnancy development with this quiz! From fertilization to birth, explore the stages of pregnancy and learn about key concepts such as prematurity, post-term, and ectopic pregnancy.

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