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Questions and Answers
What is the key feature of the germinal stage of prenatal development?
What occurs during the embryonic stage of prenatal development?
What is the period during which the embryo is most vulnerable to teratogens?
What is the consequence of factors that interfere with the implantation process during the germinal stage?
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During which stage of prenatal development does the growth and functional differentiation of organs occur?
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How long does the embryonic stage of prenatal development last?
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Study Notes
Prenatal Development Stages
- Prenatal development is divided into three stages: germinal, embryonic, and fetal.
Germinal Stage
- Starts with conception and ends approximately 2 weeks later with implantation of the embryo into the uterine wall.
- Key feature of this period: formation of the placenta.
- Interference with implantation process (genetic or environmental factors) leads to pregnancy termination.
Embryonic Stage
- Comprises the period between the third and eighth weeks of pregnancy.
- Characterized by intense cell proliferation, migration, and differentiation leading to establishment of all major organs.
- Increased vulnerability to teratogens during this period can induce major developmental defects, many of which are incompatible with life.
Fetal Stage
- Lasts from the ninth week of pregnancy to birth.
- Characterized by growth and functional differentiation of organs formed during the embryonic period.
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Description
Learn about the three stages of prenatal development: germinal, embryonic, and fetal stages. Understand the key features of each stage, including implantation and placenta formation.
