Figure 1a. (a) Right and (b) left posterior oblique renderings of CST traces superimposed on T2-weighted MR images (4000/102) in a 40-year-old healthy male volunteer. Posterior part of brain is toward the viewer. On a, hand CST is red and foot CST is green. On b, hand CST is green and foot CST is blue. CST is seen to traverse the third quarter of the PLIC. If PLIC is divided into four equal quarters from anterior to posterior, CST was shown to be in the third quarter. Hand CST is lateral and slightly anterior to foot CST, which is the same relationship as hand homunculus to foot homunculus in the precentral gyrus. These findings contradict the current understanding of the relationship of the CSTs of foot and hand in the PLIC. On a, there is some intermingling of CSTs of hand and foot.