Figure 2

ICMS mapping of frontal motor-related areas. (a) Dorsal view of the monkey brain showing the frontal regions examined for ICMS mapping. (b) Results of ICMS mapping for identification of the digit representation of the SMA. (c) Results of ICMS mapping for identification of digit representations of the M1, PMd, and PMv. The identified digit regions (in gray) are taken for morphological analyses of the large layer V pyramidal neurons. The body parts of which movements were evoked by ICMS are indicated as follows: D, digits; E, elbow; F, face; L, leg; S, shoulder; W, wrist; X, no response. ias, inferior limb of the arcuate sulcus; ml, midline; sas, superior limb of the arcuate sulcus. Other abbreviations are as in Fig. 1.