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Slice no. 1. T2-weighted midline sagittal image (20/9.2/12) (31 weeks' gestation). 1, parietooccipital fissure; 2, calcarine fissure; small arrow, marginal sulcus; large arrow, cingular sulcus.fig 3. Slice no. 2. T2-weighted parasagittal image (20/9.2/12) at the level of the sylvian fissure (28 weeks' gestation). Opercularization of the insula is completed posteriorly (arrow). Anteriorly, the insula (star) is wide open
