mjl1717
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Whats the difference between the hypoblast and the epiblast?
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| asmi
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hypoblast forms yolk sac and epiblast forms amniotic cavity.
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| mjl1717
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In addition the epiblast migrates to primitive streak and forms the endoderm,intraembryonic mesodedrm and ectoderm.
And in addition the hypoblast will eventually form the cytotrophoblast and syncytiotrophoblast
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| martinj2
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The syncytiotrophoblast and cytotrophoblast are NOT derived from hypoblast. They are derived from trophoblast (the outer cell mass).
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| EMI777LY
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hypoblast disappear
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Emily
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| Mars-Aris
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the epiblast will give rise to all 3 definitive germ layers (endoderm, mesoderm, and ectoderm.
Ectoderm is actually remaining epiblast cells.
syncytiotrophoblast & cytotrophoblast are derived from trophoblast NOT the hypoblast.
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| mjl1717
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Excuse me-I stand corrected.
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| rdsa3
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what does hypoblast form ?
:oops:
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| martinj2
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This is a matter of contention. Some authors state cells of the hypoblast proliferate and migrate along the inner surface of the cytotrophoblast to line the primary yolk sac, forming Heuser's membrane. Others state that the hypoblast is REPLACED by cells derived from the epiblast that, as a result of gastrulation, migrate throught the primitive streak to form ENDODERM that lines the yolk sac, forming Heuser's membrane. However, the important objective has been stated earlier, that is that the EPIPLAST gives rise to ALL germ layers (ectoderm, mesoderm, endoderm) that give rise to important embryonic structures. 8)
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