Significant regional sex differences in the human fetal brain. Left column: significant sex differences in the volume of the fetal cortex (composed of SP and CP) are shown on a reconstructed pial surface of 24.7 (A), 29.6 (D), and 35.29 (G) GW fetus. Positive regional sex differences (in red) indicate significantly larger volumes in females. Negative regional sex differences (in blue) indicate significantly larger volumes in males. The relative difference in the regional volumes between females and males (%) can be seen on the color-coded bars in the center. Note that the larger relative volumes of the inferior frontal gyrus for males. Right column: significant sex differences in the volume of the fetal compartments are shown on a reconstructed pial surface of the brains from the first column. (B, E, and H) Significant sex differences in the volume of the CP. (C, F, and I) Significant sex differences in the volume of the SP. Color coding of relative differences (%) is the same as in the left column.