Unlike the GPe the GPi does have a thalamic output and a smaller output towards the habenula. It also gives output to other areas including the pedunculopontine nucleus and to the area behind the red nucleus. The evolutionary increase of the internal pallidus also brought an associated increase in the pallidothalamic tracts, and the appearance of the ventral lateral nucleus in the thalamus.
The GPi differs from the GPe by having a thalamic output and a smaller output towards the habenula. It sends outputs to other areas such as the pedunculopontine nucleus and behind the red nucleus, alongside increased pallidothalamic tracts due to an evolutionary increase in the internal pallidus and the appearance of the ventral lateral nucleus.