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17 Cards in this Set
- Front
- Back
Pregnancy
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events that occur from time of fertilization until birth
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Conceptus
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the developing offspring
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gestation period
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time from the last menstrual period until birth ~ 280 days
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Embryo
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conceptus from fertilization through 8th week
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Fetus
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conceptus from week 9 through birth
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How long is the Oocyte viable?
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12-24 hours
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How long is sperm viable after ejaculation?
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24-48 hours
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for fertilization to occur, coitus must occur when?
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No more then 2 days before ovulation and 24 hours after ovulation
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Fertilization
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when the sperms' chromosomes combine with those of a secondary oocyte to form a fertilized egg (zygote)
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Acrosomal reaction
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involves breakdown of the plasma membrane and the acrosomal membrane, and release of acrosomal enzymes that digest holes through the zona pellucida
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monospermy
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the one sperm per oocyte condition
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Blastocyst
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fluid filled hollow sphere
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trophoblast cells
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display factors that are immunosuppressive
participate in placenta formation |
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What does the inner cell mass become?
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embryonic disc (embryo and 3 embryonic membranes)
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When does implantation begin?
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6-7 days after ovulation
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trophoblasts proliferate and form what two distinct layers?
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cytotrophoblast: inner layer of cells
Syncytiotrophoblast: cells in the outer layer lose their plasma membranes, invade and digest the endometrium |
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When is implantation complete?
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12th day after ovulation
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