The basal ganglia include the following masses of gray matter in the interior of each cerebral hemisphre: # Caudate nucleus # Lentiform nucleus # Amygdaloid nucleus A structure associated with the basal ganglia is the internal capsule.It is a large mass of white matter located between the caudate and lentiform nuclei and between the lentiform nucleus and thalamus. The caudate nucleus, internal capsule, and lentiform nucleus constitute the corpus striatum, meaning striped body.