26 Questions
What is the expected duration of a normal pregnancy in weeks post-fertilization?
40 weeks
Where does fertilization normally take place?
Fallopian tube
What is the significance of an ectopic pregnancy?
The embryo implants outside the uterus
What are the names and time frames for the three developmental periods?
Pre-embryonic period, Embryonic period, Fetal period
What is the initial 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 structures are formed in week 2 of development?
Embryoblast and amnion
What do the cells of the syncytiotrophoblast do?
Erode the endothelial lining of maternal capillaries
What is the function of the amnion?
To surround the entire embryo as a protective membrane
What happens at the end of implantation?
Complete embedding of the pre-embryo in the uterine endometrium
What is the structure that forms from the epiblast and hypoblast layers?
Bilaminar germ disc
What is the region called where the hypoblast is thickened?
Prechordal/Oropharyngeal Plate
What is the function of the oropharyngeal membrane?
To separate the foregut from the stomodeum
What happens on approximately day 9/10 after the formation of the bilaminar germ disc?
Development of the extraembryonic mesodermal layer
What is the structure that eventually surrounds the entire embryo?
Amnion
What is the function of the fibrin plug?
To close the defect after complete embedding of the pre-embryo
What is the duration of pregnancy from fertilization?
266 days
At what point is prematurity defined?
Before 37 weeks from the last menstrual period
When does overdue or post-term occur?
At 40 weeks from the last menstrual period
What are the three periods into which pregnancy is divided?
Germinal, embryonic, and fetal
What is the initial result of the fertilization of the egg by the sperm?
Zygote
Where does implantation of the blastocyst occur?
On the posterior superior wall of the uterus
What is ectopic pregnancy?
When the fertilized egg grows outside the uterus
What is the main cause of maternal death during the first trimester?
Ectopic pregnancy
What is the duration of the considered menstrual cycle?
28 days
How is a woman's due date calculated?
As 280 days (40 weeks) from the onset of the last menstrual period
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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