Zona Hatching

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7 Terms

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What is zona hatching?

When blastocyst escape from zona pellucida

<p>When<span style="color: purple;"> <strong>blastocyst escape</strong></span><strong> </strong>from <span style="color: purple;"><strong>zona pellucida </strong></span></p>
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What needs to occur in order for implantation to happen?

The blastocyst needs to get rid of zona pellucida

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Where does zona hatching occur?

In the uterus

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How does estrogen aid in this process?

Causes softening of zona hatching

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How does blastocyst escape zona pellucida?

Expansion and contraction of blastocyst result in tear in zona hatching

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Post Hatching

  • What happens when blastocyst escape from zona pellucida

    • This is essential for

  • After hatching blastocyst enters a phase of

  • What is the function of conceptus migration and spacing in uterus

  • What is intrauterine migration and spacing

What happens when blastocyst escape from zona pellucida: Provides first cell to cell contact between conceptus (blastocyst) and maternal uterine epithelium

  • This is essential for: Nutrient exchange and placental development

After hatching blastocyst enters a phase of: Rapid growth (hyperplasia) and development

What is the function of conceptus migration and spacing in uterus: It physically covers a large area of endometrium to regular PGF₂α release, preventing luteolysis

What is intrauterine migration and spacing: The shifting of the conceptus from its original position within uterus

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Phases in Pre-Embryonic Development

  • What are the 3 germ layers

  • What do they form

3 germ layers:

  • Ectoderm

    • Forms: External structures (skin, hair, hooves, mammary glands, neural)

  • Mesoderm

    • Forms: Heart, muscles and bones

  • Endoderm

    • Forms: Internal organs, colon, liver, pancreas

<p><strong><u>3 germ layers:</u></strong></p><ul><li><p><span style="color: red;"><strong><mark data-color="red" style="background-color: red; color: inherit;">Ectoderm</mark></strong></span></p><ul><li><p><strong><u>Forms:</u> </strong><span style="color: red;"><strong>External structures </strong></span>(<em>skin, hair, hooves, mammary glands, neural</em>) </p></li></ul></li><li><p><span style="color: green;"><strong><mark data-color="green" style="background-color: green; color: inherit;">Mesoderm</mark></strong></span></p><ul><li><p><strong><u>Forms:</u> </strong><span style="color: green;"><strong>Heart, muscles </strong></span>and <span style="color: green;"><strong>bones</strong></span><strong> </strong></p></li></ul></li><li><p><span style="color: blue;"><strong><mark data-color="blue" style="background-color: blue; color: inherit;">Endoderm</mark></strong></span></p><ul><li><p><strong><u>Forms:</u> </strong><span style="color: blue;"><strong>Internal organs, colon, liver, pancreas </strong></span></p></li></ul></li></ul><p></p>