FIGURE 4.

Separate groups of SNc neurons project to CDh and CDt in monkey SM. (A) CDh- and CDt-projecting neurons in SN. Coronal slices separated by 250 μm are shown from the rostral end to the caudal end of SN. Scale bar: 2 mm. (B) Distributions of CDh- and CDt-projecting neurons in sagittal (top) and horizontal (bottom) views (left). CDh-, CDt(i)-, and CDt(r)-projecting neurons are indicated by black, red, and green dots, respectively. Their distributions are projected to each of 3D axes (right). The P values were calculated by two-tailed t-test. (C) Discriminant analysis. CDh- and CDt-projecting neurons were best separated by a single quadratic plane (green). The neurons’ locations are projected to a parasagittal plane. White line indicates the border of SN. Between-slice interval: 250 μm