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4 Cards in this Set
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- Back
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Define embryonic development:
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From the beginning of the 3rd week after fertilization to the end of the seventh week.
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Milestones of embryonic development:
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Fourth week-partitioning of hear begins: arm and leg buds form; amnion begins to unsheathe the body stalk that becomes the umbilical cord.
Sixth week-head is much larger than body; hear is completely formed; fingers and toes present. @ this point all major organ systems are formed except for lungs. |
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Define fetal development
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Begins at 8 weeks after fertilization (10 weeks after onset of LMP)
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Milestones of fetal development:
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12 weeks - uterus palpable at the symphysis; fetus begins to make spontaneous movements.
16 weeks - experienced observers can determine gender on US. 20 weeks - weighs 300g; weight now begins to increase in a linear manner. 24 weeks - weighs 630g; fat deposition begins; terminal sacs in the lungs till not completely formed. 28 weeks - weighs 1100g; papillary membrane has just disappeared from the eyes; has 90% chance of survival if otherwise normal. 32-36 weeks - continues to increase in weight as more SQ fat accumulates. |
