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Physiologic timeline of major cranial vault suture fusion.
| Major Sutures | Complete Fusion | Details |
|---|---|---|
| Metopic suture | 3–9 months | Fuses up to 6 years or never closes |
| Closes from nasion to anterior fontanelle | ||
| Sagittal suture | 21–30 years | Unfused through childhood |
| Narrows from the 1st month | ||
| Coronal suture | ~24 years | Unfused through childhood |
| Narrows during childhood | ||
| Lambdoid suture | ~26 years | Unfused through childhood |
| Common site of Wormian bones | ||
