Figure 2.

Widths of pre- and postcentral gyri (mm) in left and right hemispheres from 25 human cadavers. Mean widths and ranges are summarized from Ono et al. (1990, pp. 152–153). S, primary somatosensory cortex; M, motor cortex. As illustrated, the range for the medial measurement for the right M is 9–22 mm rather than 9–12 mm, which is a typo in Ono et al. (C. D. Abernathey, personal communication). Note that, contrary to Einstein's brain in which the postcentral gyri are noticeably wider in their lateral compared to medial ends, particularly in the left hemisphere (Figures 1B,C), the widths of pre- and postcentral gyri in normal individuals are very similar along their entire lengths and manifest little asymmetry between hemispheres.