Slice no. 5. T2-weighted coronal image (20/9.2/12) at the level of the temporal horns (33 weeks' gestation). Large arrow, cingulate sulcus; small arrow, callosal sulcus (barely visible); 1, superior temporal sulcus (posterior part); 2, collateral sulcus; 3, hippocampal fissure.fig 7. Slice no. 6. T2-weighted coronal image (20/9.2/12) at the level of the ventricular atria (33 weeks' gestation). 1, collateral sulcus; 2, intraparietal sulcus