The thalamus, a way station for sensation, lies centrally in each hemisphere and the two together form the walls of the third ventricle, penetrating it with a central bridge of tissue (massa intermedia).
The lenticular nucleus of the basal ganglia consists of two parts, a superficial putamen and a deeper globus pallidus. The globus pallidus and adjacent portion of the thalamus perform motor integration functions. Radiating fibers to and from the cortex lie between the lenticular nucleus externally and the caudate nucleus and thalamus internally, forming the internal capsule.
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