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14 Cards in this Set
- Front
- Back
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what happens to the blastocyst as it penetrates and implants into the endometrial lining?
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the trophoblast differentiates into the cytotrophoblast and the Syncytiotrophoblast this happens about day 6 of fertilization
the embryoblast (inner cell mass) also differentiates into 2 layers the epiblast and the hypoblast |
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what do the epiblast and hypoblast do after implantation
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the epiblast forms the amniotic cavity and the hypoblast forms the yolk cavity together they make up the bilaminar disc
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what is the function of human chorionic gonadotropin after implantation
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Signals the ovary to continue to secrete
hormones to maintain the pregnancy |
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what are the highly sensitive period of pregnancy
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weeks 3-8 is when most of the major structures, heart, CNS, limbs, eyes, etc are beginning to form
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where does the mesoderm come from?
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Extraembryonic mesoderm is a new layer of cells derived from the epiblast. its develops b/t the cytotrophoblast and the amniotic and yolk cavity (epiblast and hypoblast) XE coelom begins to form with splits in the extraembryonic mesoderm
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what does the XE mesoderm do
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it creates the XE cavity and with the trophoblast (cytotrophoblast, Syncytiotrophoblast) makes the chorion and the connecting stalk which will become the umbilical cord. this is all at about 13 days
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what are the chorionic villi
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the form as extensions that bring blood to the embryo
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what do the terms somatic and splanchnic mean
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somatic-wall of body cavity (skeletal muscle) splanchnic- visceral, internal organs
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what is the purpose of gasturlation
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to form the 3 germ layers
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what is the primative streak
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line that forms on the embryotic disk (epiblasts) that marks the beginning of gastrulation (forming of 3 germ layers)
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Give the cell lineages starting with the inner cell mass and ending with 3 germ layers
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ICM--->epiblast, hypoblast, epiblast-->embryonic epiblast, amnion. Embryonic epiblast--> all three germ layers. hypoblast -->yolk
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what are Sacrococcygeal Teratoma
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remnants of primative streak, tumor of all three germ layers attached to infant
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what is the notochord
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it arises from mesoderm in the embryonic disk, is the primative axis of the embryo, will later be replaced by the vertebrate
Functions of the Notochord: • Structure - acts as a rigid axis around which the embryo develops • Skeletal - foundation upon which the vertebral column (vertebral bodies) will form • Induction - will bring about formation of the neural tube (future nervous system) |
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what are the major events of week three
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Appearance of primitive streak
(organization of the embryo) •Differentiation of the three primary germ layers •Development of the notochord |
