ABSTRACT
Corpus callosum is a co mmisural fiber connecting the cerebral hemispheres. The gender difference in the size or the shape of corpus callosum is a long standing dispute. Analysis of sexual dimorphism has been expected to provide a clue to explain sociopsychological differences. Some reported that adult female CC had more bulbous splenium and larger area considering brain size, others failed to show sexual dimorphism reported in previous studies. Only few studies were reported on sexual dimorphism of the during development. The 200 midsagittal ultrasonographs were obtained through anterior fontanelle from healthy Korean neonates (100 males, 100 females). The neonates born after 38 ~42 weeks conception were scanned and each image was analyzed with NIH image. The average area of total corpus callosum was 97.61 +/-21.05 (Mean +/-SD) mm 2 in male, 99.54 +/-20.82 mm 2 in female. Mean length of corpus callosum was 45.06 +/-4.51 mm in male, 44.46 +/-3.71 in female and mean height was 14.06 +/-1.86 mm in male, 13.4 +/-1.75 mm in female. The height of male corpus callosum was significantly higher than that of female. We could find out sexual dimorphism of spatial orientation of the corpus callosum, although there was no significant gender difference in area of corpus callosum.