Fig. (2).

Mid-sagittal (top) axial (left) and coronal (right) slices of baboon brain at week 1 (left), 16 (middle) and 32 (right) of postnatal development. The high-resolution (isotropic 500µm) T1-w images show an excellent (~25%) GM/WM contrast as well as the contrast between myelinated and unmyelinated WM. The corpus callosum is traced, and subdivided into five regions, on the midsagittal section at each age. 1 = genu, 2 = anterior midbody, 3 = medial midbody, 4 = caudal midbody, and 5 = splenium.