Fig. 2.

Electron-microscopic images of the genu of the CC in a mouse in the sector, where prefrontal axons are crossing (left) and of the lateral funiculus of the spinal cord of the macaque monkey, at the cervical level, corresponding to the sector containing cortico-spinal axons (right). Notice the disappearance of unmyelinated axons and the appearance of very large axons in the monkey. Unpublished