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14 Cards in this Set
- Front
- Back
Approximate time first division occurs |
36 hours after fertilization |
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Implantation occurs (1/100 in) |
6-12 days after fertilization |
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A bulge develops where the spinal cord will be located |
11-13 days after implantation |
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Blood cells form |
17 days after implantation |
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Heart forms (embryo 2/25 inch long) |
18 days |
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Heart beats |
24 days |
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Basis for nervous system laid (spinal cord, brain, nerves) Kidneys and reproductive ducts begin to form |
18-28 days |
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Muscles and liver form, lung buds appear (embryo 1/4 inch long) |
28 days |
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Arms and legs sprout; stomach and esophagus form |
5th week |
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Face muscles, teeth, hands, eye pigment |
6th week |
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Gonads develop- sex is determined |
7th week |
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Taste buds develop, fingernails from (embryo 1 1/2 inches long |
8th week |
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Teeth in jaws, bones develop (fetus 2 1/2) |
11-12 weeks |
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Growth |
Months 4,5,6 |