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Tritiated amino acids (L\u2010leucine, L\u2010lysine and L\u2010proline), injected into portions of the substantia nigra (SN), labeled cells in four regions, designated as, (1) rostrolateral, (2) caudolateral, (3) rostromedial and (4) central.<\/jats:p><jats:p>Rostrolateral nigral neurons transported radioactive label preferentially and abundantly to thalamic nuclei; localized isotope was found in parts of three thalamic nuclei, the medial part of the ventral lateral nucleus (VLm), the magnocellular part of the ventral anterior nucleus (VAmc), and the paralaminar part of the dorsomedial nucleus (DMpl).<\/jats:p><jats:p>Lateral neurons in the caudal half of the SN transmitted radioactive label to the same thalamic nuclei as rostrolateral nigral neurons. Isotope transported to portions of the striatum was modest and localized. Radioactive label taken up by large cells in the caudal third of the SN was transported to portions of the striatum, but not to thalamic nuclei.<\/jats:p><jats:p>Labeled nigral neurons in the medial two\u2010thirds of the rostral half of the SN, and in the middle third of the central part of the SN, transported the label mainly to parts of the caudate nucleus and putamen. In these animals modest radioactive label was seen in VLm and VAmc, but not in other thalamic nucleus.<\/jats:p><jats:p>There was no evidence that nigral neurons project to the subthalamic nucleus. No radioactive transport from nigral neurons was detected in the superior colliculus, the midbrain tegmentum, or the red nucleus, and none was transported to more caudal brain stem nuclei.<\/jats:p><jats:p>Nigrothalamic fibers arise particularly from cells in rostral and lateral parts of the substantia nigra. While some cells in other parts of the nigra project to thalamic nuclei, these appear scattered and less numerous. Large cells in caudal parts of the SN do not project to thalamic nuclei. These observations confirm nigrothalamic projections to VLm and VAmc, and identify a new nigral projection to part of the dorsomedial nucleus of the thalamus (DMp1). No nigral efferent fibers project to any of the intralaminar thalamic nuclei.<\/jats:p>","DOI":"10.1002\/cne.901650402","type":"journal-article","created":{"date-parts":[[2005,5,27]],"date-time":"2005-05-27T21:00:56Z","timestamp":1117227656000},"page":"401-415","source":"Crossref","is-referenced-by-count":251,"title":["Nigrothalamic projections in the monkey demonstrated by autoradiographic technics"],"prefix":"10.1002","volume":"165","author":[{"given":"Malcolm B.","family":"Carpenter","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Katsuma","family":"Nakano","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ronald","family":"Kim","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2004,10,9]]},"reference":[{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/0014-4886(65)90061-0"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/0024-3205(64)90161-4"},{"key":"e_1_2_1_4_1","doi-asserted-by":"crossref","first-page":"329","DOI":"10.1002\/aja.1001160117","article-title":"Further evidence for the presence of nigro\u2010neostriatal dopamine neurons in the rat Amer","volume":"116","author":"And\u00e9n N. 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