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Questions and Answers
What are the three stages of fetal development?
What are the three stages of fetal development?
Germinal, embryonic, and fetal.
What is the first stage of fetal development called?
What is the first stage of fetal development called?
Germinal stage.
What structure is formed when a sperm fertilizes an egg?
What structure is formed when a sperm fertilizes an egg?
Zygote.
What forms from the inner cell mass of the blastocyst?
What forms from the inner cell mass of the blastocyst?
What is the function of the placenta?
What is the function of the placenta?
Which of the following are germinal layers formed during fetal development? (Select all that apply)
Which of the following are germinal layers formed during fetal development? (Select all that apply)
What occurs during the embryonic stage?
What occurs during the embryonic stage?
At what week does the heart start beating?
At what week does the heart start beating?
What is formed around the fifth to sixth week of pregnancy?
What is formed around the fifth to sixth week of pregnancy?
When does the fetal stage begin?
When does the fetal stage begin?
Flashcards
Stages of fetal development
Stages of fetal development
The three stages of fetal development are the germinal stage, embryonic stage, and fetal stage.
Germinal stage
Germinal stage
The first stage of fetal development, from conception to the formation of the blastocyst.
Embryonic stage
Embryonic stage
The second stage of fetal development, where the embryo's major organ systems begin to develop.
Fetal stage
Fetal stage
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Zygote
Zygote
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Inner cell mass
Inner cell mass
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Placenta
Placenta
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Embryonic layers (select all)
Embryonic layers (select all)
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Heart beat start week
Heart beat start week
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Fetal heart formation
Fetal heart formation
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Fetal stage start
Fetal stage start
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Study Notes
Germinal Stage
- Begins at conception with fertilization of the egg by a sperm in the fallopian tube. This creates a zygote, which travels to the uterus.
- The zygote divides mitotically (cell division) from 2-celled stage to 8-16 celled stage
- The 8-16 cell stage is referred to as a morula.
- The morula continues to divide and forms a blastocyst.
- The outer layer of the blastocyst is called the trophoblast, which embeds into the uterine wall (endometrium). This begins in week one and completes in week two
- The inner cell mass of the blastocyst forms the embryo
- The trophoblast and uterine cells form the placenta.
- The placenta acts as an endocrine gland and secretes hormones such as human chorionic gonadotropin (hCG), estrogen, and progesterone to support pregnancy.
- Gastrulation is the development of the three primary germ layers: ectoderm, mesoderm and endoderm.
- The germ layers give rise to every tissue and organ in the body.
Embryonic Stage
- Occurs from the third to the eighth week
- The blastocyst develops human characteristics and is referred to as an embryo.
- Key structures and organs form during these weeks:
- Brain and spinal cord (from neural tube)
- Head, eyes, mouth
- Limbs
- The fetal heart begins to beat around weeks 5-6
- Arm and leg buds form around the sixth week.
- By the end of the eighth week, most organs and systems have taken form.
Fetal Stage
- Begins in the ninth week and continues until birth.
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Description
This quiz explores the germinal and embryonic stages of human development, beginning from the fertilization of the egg to the formation of the blastocyst and placenta. It highlights key processes such as cell division, gastrulation, and the role of trophoblast in embedding into the uterine wall. Test your knowledge on the critical early stages of human development!
