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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. |
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| Sample Animations | ||||||||
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| Rotation Animation (440 KB QuickTime file) |
Neural Tube Rotation 1 (416 KB QuickTime file) |
Neural Tube Rotation 2 (504 KB QuickTime file) |
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| Heart Rotation (356 KB QuickTime file) |
Liver Rotation (380 KB QuickTime file) |
Stomach Rotation (356 KB QuickTime file) |
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| Eyes Rotation (368 KB QuickTime file) |
Lungs Rotation (352 KB QuickTime file) |
Suprarenals Rotation (352 KB QuickTime file) |
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| Stereo View Rotation (5 MB QuickTime file, view cross-eyed) |
Stereo View Rotation (5 MB QuickTime file, view cross-eyed) |
Psuedo Timelapse (650 KB QuickTime file) |
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| Optical Images | ||||||||
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| © 2006 Bradley R. Smith | ||||||||