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29 Cards in this Set
- Front
- Back
Prenatal Development is how long? |
Starts with the beginning of pregnancy and goes until the birth of the child. |
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Pre-implantation Period starts when? |
Takes place during the first week after conception |
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Embyronic Period Starts when and last how long? |
Beginning of second week and ends the eighth week |
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Fetal Period starts when and last how long? |
Third to Ninth month |
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What is the process in order during the process of the Embryo |
Induction Prolifertion Differentiation Morphogenesis Maturation |
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What is Inducation |
Action of one group of cells on another that leads to the establishment of the developmental pathway in the responding tissue |
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What is Proliferation and how long is this present? |
Is a controlled cellular growth and accumulation of byproducts.
Present most of prenatal development |
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What is differntiation? |
Identical embryonic cells change to become distinct structurally and functionally |
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What is Morphogenesis? |
Development of specific tissue structure or differing form
due to embryonic cell migration and inductive interactions. |
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What is Maturation |
Attainment of adult function and size due to
proliferation, differentiation, and morphogenesis. |
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What exactly happens during the pre-implantation period? |
Fertilization
The ovum is penetrated by the sperm |
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What is a primordium? |
The earliest indication of a tissue type or and organ during prenatal development |
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What periods do most of the congenital malformations occur? |
Preimplantation and Embryonic period |
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Teratogens are what? |
Environmental agents; that include infections, drugs, and radiation |
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What does the union of the ovum and sperm form? |
A fertilized egg called a Zygote |
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Where do the final stages of meiosis occur? |
In the Ovum |
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What is the result of meiosis? |
The joining of the ovum's and sperms chromosomes
Enables the ovum and sperm to reduce by one half the normal number of chromosomes |
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The photographic analysis of a persons chromosome is done by an orderly arrangement of the pairs in what? |
Karyotype |
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Mitosis occurs for what? |
'Cleavage' cell division |
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Because of the ongoing process of Mitosis and secretion of fluid by the cells within the morula the zygote then becomes what? |
Blastocyst |
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What process takes place during growth or repair |
Mitosis |
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What process takes place during reproduction |
Meiosis |
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When the blastocyst travels from the site where fertilization took place where does it go and what does it do? |
Uterus to implant |
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Where does the blastocyst implant at? |
Endometrium, the innermost lining of the uterus on its back wall |
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After a week of cleavage the blastocyst consist of two layers what are they called? |
Trophoblast layer
embryoblast layer
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What does the trophoblast layer give rise to? |
important prenatal support tissues |
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Where is the trophblast layer found and what kind of cells is it made of? |
The perimeter of the blastocyst
peripheral cells |
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Embryoblast layer is made of what kind of cells? Where is the Embryoblast found? |
small inner mass of embryonic cells
In the Blastocyst |
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What does the embryoblast later give rise to? |
The embryo during the next prenatal period |