|
Ears
|
Timing
|
Source |
The first indication of the developing
internal ear can be found.
|
Approximately day 22 |
Sadler, p 382 |
| The primorida of the ears are present. |
Day 23 after fertilization |
Moore, p 5 |
| Otic placodes appear. |
Days 24-25 |
Sadler, p 110 |
| The otic pit, a sign of the first
development of the internal ear, is present. |
Day 26 after fertilization |
Moore, p 95 |
| The ear placode is present. |
Day 28 after fertilization |
Sadler, front pages |
| The ears have started to form. |
Day 30 after conception |
Rugh, p 41 |
| The external ears are developing. |
Days 35-49 |
Larsen, p 261 |
| Ear swelling is present. |
Day 36 after fertilization |
Sadler, front pages |
| The ears are forming. |
During the 2nd month |
Sadler, p 106 |
| The ears are developing rapidly. |
7th week after conception |
Rugh, p 52 |
| The auricle, or external ear, is visible. |
Day 54 after fertilization |
England, p 92 |
| The auricles of the external ear start
to take on their final shape. |
End of 8th week after fertilization |
Moore, p 100 |
| The ears stand out from the head. |
16th week after fertilization |
Williams, p 155; Moore, p 109 |
