| The globus pallidus is a wedge-shaped structure between the putamen and posterior limb of the internal capsule. |
| Atrophy is most marked in the corpus striatum of the basal ganglia, including the caudate and putamen. |
| The putamen is separated from the caudate by the anterior limb of the internal capsule. |
| The putamen of the lentiform nucleus has been removed to expose the more medially situated globus pallidus, which is so named because it is paler than the putamen. |
| Immediately above the anterior perforated substance, the pear-shaped head of the caudate nucleus is confluent with the putamen of the lentiform nucleus. |
| The dark appearance of the caudate nucleus and putamen is attributable to their content of blood vessels and neuronal cell bodies. |
