26 Questions
Where does fertilization normally take place?
Fallopian tube
What is the term used to describe a pregnancy where the fertilized egg implants outside the uterus?
Ectopic pregnancy
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 formed in week 2 of development?
Bilaminar germ disc and amnion
What is the function of the amnion?
To surround the entire embryo as a protective membrane
What is the structure that forms from the epiblast and hypoblast layers?
Bilaminar germ disc
What is the name of the region in the future head (cephalic) region where the hypoblast is thickened?
Prechordal plate
What happens to the cytotrophoblast cells in further development?
Undergo mitosis and some are added to the syncytiotrophoblast layer
What is the name of the medication used to treat early ectopic pregnancy?
Methotrexate
What is the name of the life-threatening event caused by the rupture of the fallopian tube?
Heavy bleeding inside the abdomen
What is the name of the surgical procedure in which a fiber-optic instrument is inserted through the abdominal wall to view the organs in the abdomen or to permit a surgical procedure?
Laparoscopy
What is the name of the layer that lines the inside of the cytotrophoblast and is known as the chorionic plate?
Extraembryonic mesoderm
What is the name of the cavity that forms within the extraembryonic mesodermal layer?
Extraembryonic cavity
What is the defined length of prematurity?
Before 37 weeks from the last menstrual period
When does implantation of the blastocyst occur?
Day 6-7 after fertilization
Where does ectopic pregnancy commonly occur?
Uterine tubes
What is the main cause of maternal death in the first trimester?
Ectopic pregnancy
What is the division of development in utero?
Germinal, embryonic, fetal
When does pregnancy begin?
When the egg is fertilized by the sperm
What is the length of pregnancy after fertilization?
266 days
What is the term for birth after 40 weeks from the last menstrual period?
Post-term
What are the symptoms of ectopic pregnancy?
Missed periods, nausea, and breast swelling
What is the term for the study of development from fertilization to birth?
Embryology
What occurs when the zygote undergoes cleavage?
Formation of the blastocyst
What is the occurrence rate of ectopic pregnancy in all pregnancies?
2%
Study Notes
Embryology and Pregnancy Development
- Embryology is the study of development from fertilization to birth
- The pregnancy length is about 266 days or 38 weeks after fertilization
- Prematurity is defined as birth before 37 weeks from the last menstrual period
- Overdue, or post-term, refers to birth after 40 weeks from the last menstrual period
- Development in utero is divided into germinal, embryonic, and fetal periods
- Pregnancy begins when the egg is fertilized by the sperm, forming a zygote
- The zygote undergoes cleavage, forming a blastocyst with outer and inner cell masses
- Implantation of the blastocyst occurs in the uterus by day 6-7 after fertilization
- Ectopic pregnancy occurs when the fertilized egg grows outside the uterus
- It is most common in uterine tubes and can be life-threatening if left untreated
- Ectopic pregnancy occurs in about 2% of all pregnancies and is a main cause of maternal death in the first trimester
- Symptoms of ectopic pregnancy include missed periods, nausea, and breast swelling
Test your knowledge of embryology and pregnancy development with this quiz. Explore the stages of development from fertilization to birth, including the germinal, embryonic, and fetal periods. Learn about the length of pregnancy, prematurity, and overdue births. Gain insight into ectopic pregnancy and its potential complications.
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