Distinct afferents to internal and external pallidal segments in the squirrel monkey |
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| Authors: | A Parent Y Smith M Filion J Dumas |
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| Affiliation: | Centre de Recherche en Neurobiologie, Université Laval et H?pital de l'Enfant-Jésus, Québec, Canada. |
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| Abstract: | The use of retrograde fluorescence double-labeling method has revealed that the internal (GPi) and external (GPe) segments of globus pallidus in squirrel monkey receive projections from different cell populations in striatum and subthalamic nucleus. Striatal neurons projecting either to GPi or GPe formed wide and nonoverlapping cell bands oriented obliquely and covering large portions of putamen and caudate nucleus. Subthalamic neurons projecting to GPe were more abundant and more laterally located than those projecting to GPi. A few cells branching to GPi and GPe were found in subthalamic nucleus but not in striatum. Thus, different striatal and subthalamic neuronal populations influence GPi and GPe in primates. |
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