FIGURE 6.

Summary of local excitatory inputs to CSNs and hypothesized circuit for motor control. (A) Although lower L2/3 pyramidal neurons send a considerable number of apposed boutons to CSNs, the strongest inputs are derived from L3d/L4 star-pyramidal neurons. The thickness of a curved arrow indicates the relative intensity of the projection. (B) A conceivable cortical circuit for motor control, which is composed of thalamic afferents and local connections to CSNs. Modified with permission from Figure 9 of Cho et al. (2004b) and Figure 9 of Kuramoto et al. (2009).