The sulci measured were the olfactory sulcus (16 weeks), the parieto-occipital sulcus (22-23 weeks), the superior temporal sulcus (32 weeks) and the orbitofrontal sulcus (36-39 weeks). 
These maps provide a statistical description of the variability of the location of each orbitofrontal sulcus within the three-dimensional coordinate system of Talairach and Tournoux (1988).
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