Embryonic Devel- 49

Embryonic Devel- 49 - Chapter 49 Embryonic Development...

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Chapter 49 Embryonic Development
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Developmental stages of humans ¢ Fertilization ¢ Zygote l It is a fertilized egg l Female pronuclei l Male pronuclei l Amphimixis
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Developmental stages of humans ¢ Zona pellucida l Surrounds the zygote l Disappears when the blastocyst reaches the uterine cavity ¢ Corona radiata l Granulosa cells surrounding the zona pellucicda l Disappears after fertilization
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Fertilization
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Developmental stages of humans ¢ Cleavage ¢ Stages of the Cleavage l Blastomere ¢ Early cleavage l 4-cells stage… ¢ Morula l 16-32 cells stage
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Developmental stages of humans ¢ Blastula l Central cavity appears – blastocystic cavity l Blastocyst Inner cell mass (ICM) – forms the embryo Trophoblast – nourishes the developing embryo ¢ Final product of cleavage
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Developmental stages of humans ¢ Implantation l From day 7 to day 14 after the ovulation l The blastocyst will go from a floating stage to a complete implanted stage in the uterus l Deciduas basalis-part of the endometrium beneath the ICM. It will form the maternal portion of the placenta
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Embryonic Devel- 49 - Chapter 49 Embryonic Development...

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