THE DISTRIBUTION OF THE GLOBUS-PALLIDUS NEURONS WITH INPUT FROM VARIOUS CORTICAL AREAS IN THE MONKEYS

Single neuron activities of the globus pallidus were recorded in awake monkeys. Electrical stimulation of various cortical areas (the prefro ntal, premotor, supplementary motor and arcuate premotor areas, and th e motor cortex) inhibited spontaneous discharge of pallidal neurons. T his inhibitory response was considered to be mediated through the stri atum. Considerable number of pallidal neurons responded to the stimula tion of more than one cortical areas. However, the neurons receiving i nputs from the motor cortex and/or arcuate premotor area and those rec eiving inputs from the prefrontal, premotor and/or supplementary motor areas were segregated. The former neurons were located ventrolaterall y in the caudal part of the globus pallidus, while the latter ones wer e located dorsomedially in the rostral part of the globus pallidus.