Podcast
Questions and Answers
What significant development occurs just two weeks after conception?
What significant development occurs just two weeks after conception?
- The development of the cerebral cortex
- The beginning of the fetal movement
- The growth of the mesoderm
- The formation of the neural plate (correct)
At what point in prenatal development do the first neurons and synapses develop?
At what point in prenatal development do the first neurons and synapses develop?
- By week 4
- By week 7 (correct)
- By week 6
- By week 9
What is the zygote's status during the first two weeks of prenatal development?
What is the zygote's status during the first two weeks of prenatal development?
- It develops full organs and structures.
- It is known as an embryo.
- It moves towards the uterus and begins to implant. (correct)
- It begins to differentiate into major organ systems.
Which layer of the embryonic disc will form the skin and nervous system?
Which layer of the embryonic disc will form the skin and nervous system?
At what stage is the developing human referred to as a fetus?
At what stage is the developing human referred to as a fetus?
What happens during the folding of the neural plate?
What happens during the folding of the neural plate?
When does early learning begin in the fetus, and what can it respond to?
When does early learning begin in the fetus, and what can it respond to?
During which stage do major organs and structures begin to develop?
During which stage do major organs and structures begin to develop?
What shape does the neural tube resemble after the neural plate has folded?
What shape does the neural tube resemble after the neural plate has folded?
Which of the following is NOT a characteristic of the fetal stage?
Which of the following is NOT a characteristic of the fetal stage?
What significant developmental feature is formed during the germinal stage?
What significant developmental feature is formed during the germinal stage?
Which stage of prenatal brain development is characterized by the development of the three-layered embryonic disc?
Which stage of prenatal brain development is characterized by the development of the three-layered embryonic disc?
By what day are chemical signals sent to the ectoderm to initiate the growth of the neural plate?
By what day are chemical signals sent to the ectoderm to initiate the growth of the neural plate?
What happens during the embryonic stage by the end of the second month?
What happens during the embryonic stage by the end of the second month?
Which statement is true regarding the viability of the fetus?
Which statement is true regarding the viability of the fetus?
What percentage of zygotes typically survive beyond the first two weeks?
What percentage of zygotes typically survive beyond the first two weeks?
Flashcards
Prenatal Development Stages
Prenatal Development Stages
The process of development from conception to birth, divided into three stages: germinal, embryonic, and fetal.
Germinal Stage
Germinal Stage
The first two weeks after conception, when the zygote implants in the uterus and the placenta forms.
Embryonic Stage
Embryonic Stage
Weeks 2-8 after conception, marked by rapid development of major organs and structures.
Fetal Stage
Fetal Stage
Signup and view all the flashcards
Zygote
Zygote
Signup and view all the flashcards
Embryo
Embryo
Signup and view all the flashcards
Fetus
Fetus
Signup and view all the flashcards
Conception
Conception
Signup and view all the flashcards
Neural Tube Formation
Neural Tube Formation
Signup and view all the flashcards
Ectoderm's Role
Ectoderm's Role
Signup and view all the flashcards
Neural Plate
Neural Plate
Signup and view all the flashcards
When does brain development begin?
When does brain development begin?
Signup and view all the flashcards
Myelination
Myelination
Signup and view all the flashcards
Early Learning in Utero
Early Learning in Utero
Signup and view all the flashcards
Fetus' Size at Birth
Fetus' Size at Birth
Signup and view all the flashcards
Synapse Development
Synapse Development
Signup and view all the flashcards
Study Notes
Prenatal Development
-
Prenatal development, also called antenatal development, spans from conception to birth (typically nine months).
-
Fertilization initiates the process.
-
Stages:
- Zygote: Conception to 2 weeks
- Embryo: 2 weeks to 8 weeks
- Fetus: 9 weeks to birth
-
Conception: Sperm fertilizes egg, requiring healthy egg release, egg migration, and sperm penetration.
-
Germinal Stage (first 2 weeks):
- Zygote moves to uterus and implants.
- Placenta and umbilical cord form.
- Cell differentiation begins.
- Fewer than half of zygotes survive past 2 weeks.
-
Embryonic Stage (weeks 2-8):
- Developing organism attaches to uterus, becoming an embryo.
- Major organs and structures start developing.
- Embryo grows to 1 inch by the end of the phase.
- Primitive eyes, nose, lips, teeth, arms, and legs begin forming.
- Heartbeat develops.
-
Fetal Stage (2 months to birth):
- Embryo becomes a fetus at 8 weeks.
- Significant growth occurs.
- Muscle contractions and movement develop.
- Fetal position develops.
- First bone cells appear.
- Head, leg, and feet movements develop.
- Quickening (mother feeling fetal movement) around 4th month.
- Viability (ability to survive outside the womb) around seventh month.
- Average birth weight and length at 7.5 pounds and 20 inches, respectively, at birth's end.
Prenatal Brain Development
- Brain development begins in the first trimester.
- Most structural brain features established by the 8th week.
- Neural plate, folding into a neural tube forms by week 4 (brain and spinal cord).
- Neurons and synapses appear by week 7, allowing movement.
- Cerebral cortex thickens and becomes more complex during the second trimester.
- Myelin appears on neuronal axons, accelerating information processing.
- Early learning activities occur during the third trimester, including response to sound and recognition of familiar sounds (mother's voice).
- Embryonic disc forms 3 layers (ectoderm, mesoderm, endoderm).
- Ectoderm develops skin, hair, and nervous system.
- By day 15, head and brain develop.
- Nervous system development (weeks 3-4).
- Chemical signals create a thickened neural plate by day 18.
- Neural plate folds into a neural tube (precursor to brain and spinal cord) by week 4.
- Tube seals except at ends; openings close.
- Defined swelling at the top of the tube appears by week 3.5.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Explore the fascinating stages of prenatal development from conception to birth. This quiz covers key phases including the zygote, embryo, and fetus, as well as critical processes like fertilization and implantation. Test your knowledge on how life begins and develops in the womb.
