has soma location has soma location expresses expresses GABAergic neuron neuron of the forebrain internal globus pallidus core projecting neuron A projection neuron that has its soma located in the internal segment of the globus pallidus (GPi) of primates, in the central “core” region. It expresses parvalbumin, is primarily GABAergic, and projects to motor thalamic nuclei including the ventral anterior, ventrolateral, and ventromedial nuclei. In the rodent homolog (entopeduncular nucleus), the core subregion is characterized by concentrated parvalbumin-positive neurons targeting the ventral anterior-ventral lateral thalamic nucleus and receives inputs from the dorsolateral striatum innervated by sensorimotor cortices (Miyamoto & Fukuda, 2022). This neuron corresponds to the sensorimotor output population of the GPi, as demonstrated in human tissue and cross-species comparative studies (Wallace et al., 2017) and by classic tracing in primates (Parent & De Bellefeuille, 1982; Parent et al., 2001). parvalbumin alpha medial globus pallidus