Period of the Zygote - Implantation + Germ disc

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Last updated 10:26 PM on 8/28/26
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14 Terms

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Implantation - 5 days

Zygote enters uterus

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Implantation - 6-7 days

Zygote attaches to uterine wall

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Implantation - 12-14 days

  • Zygote implants on uterine wall

  • Connects with blood vessels

  • Signals parents’ brain

  • Triggers hormones

  • Physiological reactions


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What is the germ disc

Component of the blastocyst sphere - potential to turn into an embryo

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Gastrulation - germ disc has 3 layers of cells

  • WHAT

  • WHAT

  • WHAT


Gastrulation - germ disc has 3 layers of cells

  • Ectoderm

  • Mesoderm

  • Endoderm


<p>Gastrulation - germ disc has 3 layers of cells </p><ul><li><p>Ectoderm </p></li><li><p>Mesoderm </p></li><li><p>Endoderm </p></li></ul><p></p>
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Ectoderm

Outer layer

<p>Outer layer </p>
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Mesoderm

Middle layer

<p>Middle layer </p>
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Endoderm

Inner layer

<p>Inner layer </p>
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Week 3

  • Neural tube

  • Vestigial structures: 1. Tails 2. Gills


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Week 4

  • Organ and limbs

  • Eyes


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Week 5

  • Kidneys

  • Mouth and Tongue


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week 6

  • Face

  • Lips

  • Nose

  • Eyelids

  • Limbs


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Week 7

  • Brian and nervous system

  • Neurogenesis


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Week 8

  • Knees

  • Ankles

  • Elbows