Fig. 1.

Distribution of CM cells innervating the motoneurons of a shoulder or an elbow muscle. (Upper) Results from injections of rabies into the SpD muscle. (Lower) Results from injections into the lateral head of the lTri muscle. Each map shows an unfolded reconstruction of layer V from an experimental case. Each dot represents a labeled CM cell. In this and other figures, the vertical dashed line in each map represents the edge of the CS, and vertical dotted lines indicate the approximate location of cytoarchitectonic borders. The central Inset shows the general location of the reconstructed area on a lateral view of the macaque cerebral hemisphere. Note that most shoulder and elbow CM cells are located medially in the CS. ArS, arcuate sulcus; C, caudal; M, medial; Gyrus, crest of the precentral gyrus; Sulcus, anterior bank of the CS.