The diagram below shows a simple sketch as to the connections of the basal ganglia. The basal ganglia receive inputs from many areas of association cortex, and send information back to the premotor and supplementary motor cortices, chich in turn control the output of the motor cortex through the cortico-spinal tract. Note that there is a circuit from the basal ganglia to the substanita nigra. Another looped circuit from the basal ganglia passes through the subthalamic nucleus and back(not shown in this diagram).
* |