 |
 |
 |
 |
About Carnegie Stage 18 Most embryos at stage 18 are approximately 44 postovulatory days old and measure 13-17 mm in length. Distinguishing criteria for this stage include cervical and lumbar flexures, distinct notching in the hand plate, the first appearance of the elbow, eyelid folds may appear in more advanced specimens, and auricular hillocks begin to form distinct parts of the external ear. |
|
|
||
 |
 |
 |
| Sample Animations | ||
 |
 |
 |
|
|
|
|
| Optical Images | ||
 |
 |
 |
|
|
|
|
|
|
|
|