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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.

Pre-implantation Period starts when?

Takes place during the first week after conception

Embyronic Period Starts when and last how long?

Beginning of second week and ends the eighth week

Fetal Period starts when and last how long?

Third to Ninth month

What is the process in order during the process of the Embryo

Induction


Prolifertion


Differentiation


Morphogenesis


Maturation

What is Inducation

Action of one group of cells on another that leads to the establishment of the developmental pathway in the responding tissue

What is Proliferation


and how long is this present?

Is a controlled cellular growth and accumulation of byproducts.



Present most of prenatal development

What is differntiation?

Identical embryonic cells change to become distinct structurally and functionally

What is Morphogenesis?

Development of specific tissue structure or differing form



due to embryonic cell migration and inductive interactions.

What is Maturation

Attainment of adult function and size due to



proliferation, differentiation, and morphogenesis.

What exactly happens during the pre-implantation period?

Fertilization



The ovum is penetrated by the sperm

What is a primordium?

The earliest indication of a tissue type or and organ during prenatal development

What periods do most of the congenital malformations occur?

Preimplantation and Embryonic period

Teratogens are what?

Environmental agents; that include infections, drugs, and radiation

What does the union of the ovum and sperm form?

A fertilized egg called a Zygote

Where do the final stages of meiosis occur?

In the Ovum

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

The photographic analysis of a persons chromosome is done by an orderly arrangement of the pairs in what?

Karyotype

Mitosis occurs for what?

'Cleavage' cell division

Because of the ongoing process of Mitosis and secretion of fluid by the cells within the morula the zygote then becomes what?

Blastocyst

What process takes place during growth or repair

Mitosis

What process takes place during reproduction

Meiosis

When the blastocyst travels from the site where fertilization took place where does it go and what does it do?

Uterus to implant

Where does the blastocyst implant at?

Endometrium, the innermost lining of the uterus on its back wall

After a week of cleavage the blastocyst consist of two layers what are they called?

Trophoblast layer



embryoblast layer


What does the trophoblast layer give rise to?

important prenatal support tissues

Where is the trophblast layer found and what kind of cells is it made of?

The perimeter of the blastocyst



peripheral cells

Embryoblast layer is made of what kind of cells?


Where is the Embryoblast found?

small inner mass of embryonic cells



In the Blastocyst

What does the embryoblast later give rise to?

The embryo during the next prenatal period