Chapter 4: Development Flashcards
What is the first step of prenatal development?
Fertilization
How many stages are there to prenatal development? Name them.
3 stages
- Zygote
- Embryo
- Fetus
What is the gestation period for Zygote?
Time of conception to 2 weeks
When does an egg become a zygote?
When the egg has been fertilized
What is a key characteristic of the Period of the Zygote?
Rapid cellular division
What is a blastocyst? Explain how the structures of the blastocyst will form.
A rapidly dividing ball of cells . Inner layer will become the embryo and outer layer will become its protection
What is the gestation period for the Embryo?
2 to 8 weeks
What are the key characteristics of the period of the embryo
- Major organs and systems begin to develop
2. Cephalocaudal and Proximodistal changes occur
What is the gestation period for The Fetus
Fetus is the longest gestation period.
9 weeks of gestation to birth
What are key characteristics of the period of the Fetus?
- Fetus begins to look more human
- finishing touches/refinements
- Most significant period of development
- Brain Development
- Weight gain
- Head moves to the lower belly
When can a fetus survive outside of the womb?
Starting at 22 week
In the fetal development stage, what does the fetus’s brain develop?
Sulci and Gyri
Explain what a teratogen is.
Environmental things that contribute negatively to the pregnancy
What is the critical period of teratogens to be avoided?
2 to 8 weeks gestation (embryotic period)
Name the most common teratogens?
Alcohol, Cigarettes, medication, specific viruses, drugs
Alcohol as a teratogen causes what type of defect?
Fetal Alcohol Syndrome