the significance of the basal ganglia for motor function.?

Answer 1

The basal ganglia are found in the brain and are linked to the motor cortex. At the beginning of the 20th century, the basal ganglia system was associated with motor functions, as lesions of these areas would often result in disordered movement in humans (chorea, athetosis, Parkinson's disease).

See more specifics at:

http://en.wikipedia.org/wiki/Basal_ganglia