Embryonic Development

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Embryonic Development

• By
• Rachel F., Katelyn M.,
• Marli M., and
• Katina R.

2
What is Embryonic Development?

• Embryonic Development is when the embryo is
  formed and develops.
• It starts with the fertilization of a egg, which
  after is called a zygote. The zygote goes
  through rapid divisions.
• The scientific name for it is Embryogenesis.

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Stages of Embryonic Development

• Embryonic Development has 4 stages
• Cleavage
• Patterning
• Differentiation
• Growth

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Cleavage

• Cleavage is the first stage of embryonic
  development.
• In this stage the cell starts to divide. Each
  with the exact genes in the zygote. It is
  controlled by the mothers genes.
• In the end of the process of Cleavage the zygote
  is now called a blastula.

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The Different Stages of the Organism.
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Patterning

• This is the second phase.
• During this phase the cells produced by Cleavage
  organize themselves in layers and masses.
• Parts of the organism that develop
• Front and the rear.
• Back side and belly side.
• Left and right side.
• During this process three major germ layers are
  formed
• Ectoderm
• Mesoderm
• Endoderm
• By the end of this process the zygotes genes are
  expressed.

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Differentiation

• This is the third stage.
• It starts to make specialized structures and has
  more functions.
• The body now produces neurons, skin cells, muscle
  cells and etc.
• The organized into tissues, the tissues organize
  into organs, and the organs into systems.

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Growth

• This is the last stage.
• In this stage the organism goes through a period
  of growth.
• New cells are formed and more extra cellular
  matrix.

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The First Trimester

• The first trimester is when the cell starts to
  divide.
• The zygote begins to develop.
• At the end of this trimester the
• Head is round
• Eyes are closed
• Taste buds are forming
• The internal organs move into the body cavity
• Upper and lower limbs are formed.

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The Second Trimester

• In the second trimester the baby is becoming more
  developed. The baby develops more.
• At the end of the trimester
• The babys eyes are open.
• The sex is determined.
• The baby weighs 12.5 ounces.
• Bones and muscles are growing steadily.

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The Third Trimester

• In the third trimester the baby is developing.
• What is developed
• Footprints and fingerprints are formed
• Eyelids open and close
• Brain development grows rapidly
• The baby is born

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The End