Chapter 3.1 Overview of Embryology Flashcards Preview

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Flashcards in Chapter 3.1 Overview of Embryology Deck (14):
1

Embryology deals with the developmental events that occur during the

Prenatal period

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The prenatal period is the first

38 weeks of human development that begin with the fertilization of the secondary oocyte and end with birth

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The prenatal period is broken down into shorter periods

*The pre-embryonic period
*The embryonic period
*The fetal

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The pre-embryonic period is

The first 2 weeks of development (the first 2 weeks after fertilization), when the single cell produced by fertilization (the zygote) becomes a spherical, multicellular structure (a blastocyst). This period ends when the blastocyst implants in the lining of the uterus

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The embryonic period includes

The third through eighth weeks of development. Time during which rudimentary versions of the major organ systems appear in the body, which is now called the embryo

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Includes the remaining 30 weeks of development prior to birth, when the organism level is called a fetus. During this period, the fetus continues to grow, and its organs increase in complexity

The fetal period

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The developmental processes that occur in the pre-embryonic and embryonic periods are known collectively as

Embryogenesis

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Embryogenesis and its stages are separated into

Cleavage, gastrulation, and organogenesis

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The zygote divides by mitosis to form a multicellular structure called a blastocyst

Cleavage

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The blastocyst cells form three primary germ layers, which are the basic cellular structures from which all body tissues develop

Gastrulation

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The three primary germ layers arrange themselves in ways that give rise to all organs in the body

Organogenesis

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Following birth, an individual spends a great portion of his or her life undergoing

Maturation

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During maturation the body grows and develops, and these organs become mature

Sex organs

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The sex organs (ovaries in the female, testes in the male) then begin to produce sex cells, or gametes through a process called

Gametogenesis