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- W2126019724 abstract "The goal of the present study was to determine the ascending sources to the pre-supplementary motor area (pre-SMA) in macaque monkeys using multiple labeling techniques. We labeled the pallidothalamic projections using biotinylated dextran amine (BDA) and the cerebellothalamic projections using wheatgerm agglutinin conjugated to horseradish peroxidase. The pre-SMA thalamocortical projections neurons were also labeled using cholera toxin subunit b following identification of the pre-SMA by location, and by movements evoked by intracortical microstimulation. The extent of pre-SMA was later confirmed by identifying characteristics from Nissl cytoarchitecture and SMI-32 immunoreactivity. Thalamic nuclear boundaries were based on Nissl cytoarchitecture, acetylcholinesterase chemoarchitecture and Cat-301 immunoreactivity. Cerebellothalamic afferents were distributed predominantly to ventral lateral posterior nucleus (VLp), including medial and dorsal VLp, while the pallidothalamic afferents projected more rostrally to ventral lateral anterior nucleus (VLa) and ventral anterior nucleus (VA). The pre-SMA thalamocortical projection neurons were primarily found in VA and medial VLp. However, scattered cells were also found in VLa, dorsal VLp, central lateral nucleus (CL) and mediodorsal nucleus (MD). Scattered pre-SMA projecting cells overlapped foci of cerebellar label in medial VLp. Additionally, limited overlap of pre-SMA cells and pallidothalamic labeling was found in caudal VA. These findings suggest that the pre-SMA is uniquely positioned to integrate ascending basal ganglia and cerebellar information after a relay from VA and medial VLp. These anatomical findings are consistent with the recent hypothesis that the pre-SMA acts as the coordinator of visual and motor loops in motor learning [J. Cogn. Neurosci. 13 (2001) 626]." @default.
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- W2126019724 date "2003-08-01" @default.
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- W2126019724 title "Ascending inputs to the pre-supplementary motor area in the macaque monkey: cerebello- and pallido-thalamocortical projections" @default.
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- W2126019724 doi "https://doi.org/10.1016/s1472-9288(03)00018-9" @default.
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