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Appearance of sulci by gestational age*
| Sulcus | Detectable by Pathology in 25–50% of Fetuses48 (wk) | Detectable by Fetal MR Imaging in 75% of Fetuses9 (wk) |
|---|---|---|
| Parietooccipital | 16 | 22–23 |
| Calcarine | 16 | 24–25 |
| Callosal | 14 | 22–23 |
| Cingulate | 18 | 24–25 |
| Central | 20 | 27 |
| Precentral | 24 | 27 |
| Postcentral | 25 | 28 |
| Superior temporal | 23 | 27 |
| Superior frontal | 25 | 29 |
| Inferior frontal | 28 | 29 |
| Inferior temporal | 30 | 33 |
Modified from Garel et al9.
