page_title: Globus pallidus
section_title: Common afferents
hierarchical_section_title: Globus pallidus / Function / Common afferents
caption_attribution_description: two schematic drawings of coronal sections of human brain labelling the basal ganglia. Blue=striatum, green=globus pallidus (external and internal segments), yellow=subthalamic nucleus, red=substantia nigra (pars reticulata and pars compacta). The right section is the deeper one, closer to the brainstem. Català: Tall coronal del cervell humà mostrant els ganglis basals.
context_page_description: The globus pallidus also known as paleostriatum or dorsal pallidum, is a subcortical structure of the brain. It consists of two adjacent segments, one external, known in rodents simply as the globus pallidus, and one internal, known in rodents as the entopeduncular nucleus. It is part of the telencephalon, but retains close functional ties with the subthalamus in the diencephalon – both of which are part of the extrapyramidal motor system. The globus pallidus is a major component of the basal ganglia, with principal inputs from the striatum, and principal direct outputs to the thalamus and the substantia nigra. The latter is made up of similar neuronal elements, has similar afferents from the striatum, similar projections to the thalamus, and has a similar synaptology. Neither receives direct cortical afferents, and both receive substantial additional inputs from the intralaminar thalamus.
context_section_description: The two parts receive successively a large quantity of GABAergic axonal terminal arborisations from the striatum through the dense striato-pallidonigral bundle. The synaptology is very peculiar (see primate basal ganglia system). The striatal afferents contribute more than 90% of synapses.
  The two pallidal nuclei receives dopaminergic axons from the pars compacta of the substantia nigra.
caption: Coronal slices of human brain showing the basal ganglia.
  ROSTRAL: striatum, globus pallidus (GPe and GPi)
  CAUDAL: subthalamic nucleus (STN), substantia nigra (SN)
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