Primate basal ganglia system  From Wikipedia, the free
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navigation, search  The basal ganglia form a major brain system
in all species of vertebrates, but the basal ganglia of primates
(including humans) have special features that justify a separate
consideration. As in other vertebrates, the primate basal
ganglia can be divided into striatal, pallidal, nigral, and
subthalamic components. In primates, however, the two pallidal
subdivisions are called the external and internal (or sometimes
lateral and medial) segments of the globus pallidus, whereas in
other species they are called the globus pallidus and
entopeduncular nucleus. Also in primates, the striatum is
divided by a large tract of white matter called the internal
capsule into two masses of gray matter that early anatomists
named the caudate nucleus and putamen—in most other species no
such division exists, and only the striatum as a whole is
recognized. Beyond this, the complex topography