Table 2:

Chronology of sulcal development during 12–22 weeks GAa

SulciObserved 25%–75%Present ≥ 75%SulciObserved 25%–75%Present ≥ 75%
Medial Cerebral SurfaceLateral Cerebral Surface
Interhemispheric fissure−b12Lateral sulcus1214
Callosal sulcus1214Superior frontal sulcus1516
Cingular sulcus1214Inferior frontal sulcus1822
Calcarine fissure1315Posterior part of superior temporal sulcus1618
Parieto-occipital sulcus1516Inferior temporal sulcus1516
Ventral Cerebral SurfaceVertex
Hippocampic fissure1214Precentral sulcus1618
Orbital sulcus1516Central sulcus1516
Collateral sulcus1618
Occipitotemporal sulcus2022
Olfactory sulcus1516

  • ↵a Sulci were present on 7T postmortem MR imaging scans.

  • ↵b No cases were studied.