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15 Cards in this Set
- Front
- Back
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Which layer of the embryo is present following the first week of development?
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hypoblast
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When does the secondary oocyte complete the second meiotic division?
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fertilization
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Sperm penetration into the zona pellucida is facilitated due to the action of enzymes released from which portion of the sperm?
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acrosome
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What is a number of a normal sperm count?
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300 million
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Freshly ejaculated sperm are not capable of fertilizing the oocyte because they have yet to complete which process?
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capacitation
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Routine ultrasound performed on a pregnant woman revelaed 12 live embryos. What is the cause of this?
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twelve oocytes were fertilized by 12 sperm
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Concerning an 8 day blastocyst`
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partially implanted in endometrium
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Concerning the Syncytiotrophoblast
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surrounds the 13 day embryo
derived from the cytotrophoblast |
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The amniotic cavity develops between which layers?
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embryonic disc
trophoblast |
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In the 14 day blastocyst
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extraembryonic coelom surrounds yolk sac
uteroplacental circulation established extraembryonic mesoderm split into 2 layers completely implanted in endometrium |
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10-12 day blastocyst
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conceptus lies deep to endometrial epithelium
defect in endometrial epithelium closed implanted blastocyst produces an elevation on endometrial surface maternal blood begins to flow slowly through lacunar networks |
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Wall of chorionic sac composed of
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2 trophoblast layers lined by
extraembryonic somatic mesoderm |
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During the second week of development lacunar networks develop where?
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syncytiotrophoblast
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What is the most common site for ectopic implantations?
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uterine tube(ampulla)
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Which structures are formed during the second weeek of development?
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amniotic cavity
yolk sac connecting stalk chorion |
