What is the most significant neurotransmitter in the basal ganglia?

dopamine

In vertebrates the basal ganglia is located in the base of the forebrain. The basal ganglia is associated with a variety of functions such as voluntary motor control, eye habits and emotional functions.

As basal ganglia is involved in controlling your muscle activity, any lesions or damages to your basal ganglia might cause hypertonia and/or various abnormal involuntary and purposeless movements.

Some examples of diseases that are related to basal ganglia are parkinson's disease, chorea, athetosis and hemiballismus.

The Basal Nuclei or the Basal Ganglia

The plural of ganglion is ganglia or ganglions.