|
Blood
|
Timing
|
Source |
Blood and blood vessels begin to develop.
|
Days 13-15 after fertilization |
England, p 110 |
| The embryo begins to form blood cells. |
Day 17 after conception |
Rugh, p 17 |
| The first blood vessels form. |
Day 18 of development |
Larsen, p 123 |
| The mother's blood may be type O and
that of the fetus may be type A. |
Nap |
Rugh, p 217 |
| Blood cells are developing. |
End of 3rd week after fertilization |
Moore, p 76 |
| Embryonic blood vessels begin to develop. |
3rd week after fertilization |
Moore, p 76 |
| Blood vessels appear. |
3rd week after fertilization |
Williams, p 161 |
| Blood cells and blood vessels are
differentiated. |
End of the 3rd week of development |
Sadler, p 77 |
| The vascular system appears. |
Middle of the 3rd week |
Sadler, p 208 |
| The cardiovascular system has formed. |
4th week after fertilization |
Williams, p 161 |
| The aorta is developing. |
Day 36 of development |
Larsen, p 156 |
| The major blood vessels of the body
take on their final scheme. |
Day 56 after conception |
Rugh, p 53 |
| Red blood cells are forming in the
spleen. |
End of 12th week after fertilization |
Moore, p 112 |
| |
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