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In this analysis the thalamic projections to each of these three cortical fields were examined and compared by using retrogradely transported fluorescent dyes (Fast Blue, Diamidino Yellow, Rhodamine and Green latex microspheres) as neuron labels. Coincident labeling of projections to 2\u20133 cortical sites in each monkey allowed the direct comparison of the soma distributions within the thalamic space of the different neuron populations projecting to areas 3a, 3b, and 4, as well as to boundary zones between these cortical fields. The soma distribution ofthalamic neurons projecting to a small circumscribed zone (diameter = 0.5\u20131.0 mm) strictly within cortical area 3a (in region of hand representation) filled out a \u201cterritory\u201d traversing the dorsal half of the cytoarchitectonically defined thalamic nucleus, VPLc (abbreviations as in Olszewski [1952] The Thalamus of the <jats:italic>Macaca mulatta<\/jats:italic>. Basel: Karger). This elongate, rather cylindrical, territory extended caudally into the anterior pulvinar nucleus, but not forward into VPLo. The rostrocaudal extent of the thalamic territory defining the soma distribution of neurons projecting to small zones of cortical area 3b was similar, but typically extended into the ventral part of VPLc, filling out a medially concavo\u2010convex laminar space. Two such territories projecting to adjacent zones of areas 3a and 3b, respectively, overlapped and shared thalamic space, but not thalamic neurons. Contrasting with the 3a and 3b thalamic territories, the soma distribution of thalamic neurons projecting to a circumscribed zone in the nearby motor cortex (area 4) did not penetrate into VPLc, but instead filled out a mediolaterally flattened territory extending from rostral VLo, VLm, VPLo to caudal and dorsal VLc, LP, and Pulo. These territories skirted around VPLc. All three cortical areas (4, 3a, and 3b) also received input from distinctive clusters of cells in the intralaminar Cn.Md. It is inferred that, in combination, the thalamic territories in areas 3a, 3b, and 4 (and also area 1 and 2), which would be coactive during the execution of a manual task, constituted a lamellar space extending from VLo rostrally to Pul.o caudally. How Pul.o neuron populations relate to the more rostral populations within the same thalamic territory projecting to a localized cortical zone remains uncertain. Within the medially located territories the distribution of the neuron population in Pul.o was spatially continuous with the more rostral thalamic cells projecting to the same localized cortex, but in lateral thalamic territories these 2 populations were usually spatially discontinous. In the newborn macaque an orderly change in the territorial projections to localized zones in area 4, 3a, and 3b was also demonstable. However, thalamic nuclear projections were more expansive than in the mature animal. As well as the VPLc input, a third of the thalamic input to area 3a was now from VLo, VPLo, and VLm. Area 4 also had a significant input from VPLc, an input not observed in the mature macaque. \u00a9 1993 Wiley\u2010Liss, Inc.<\/jats:p>","DOI":"10.1002\/cne.903350204","type":"journal-article","created":{"date-parts":[[2005,1,1]],"date-time":"2005-01-01T09:00:55Z","timestamp":1104570055000},"page":"173-199","source":"Crossref","is-referenced-by-count":55,"title":["Thalamic projections to areas 3a, 3b, and 4 in the sensorimotor cortex of the mature and infant macaque monkey"],"prefix":"10.1002","volume":"335","author":[{"given":"Corinna","family":"Darian\u2010Smith","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ian","family":"Darian\u2010Smith","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":"10.1152\/jn.1990.64.1.133"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1146\/annurev.ne.09.030186.002041"},{"key":"e_1_2_1_4_1","doi-asserted-by":"publisher","DOI":"10.1152\/jn.1991.66.3.879"},{"key":"e_1_2_1_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/0165-0173(83)90014-0"},{"key":"e_1_2_1_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/0165-0173(83)90016-4"},{"key":"e_1_2_1_7_1","doi-asserted-by":"publisher","DOI":"10.1002\/cne.902200210"},{"key":"e_1_2_1_8_1","volume-title":"Vergleichende Lokalisationlehre der Grosshirnrinde in ihren Prinzipien dargestellt auf Grund des Zellenbaues","author":"Brodmann K.","year":"1909"},{"key":"e_1_2_1_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/0165-0270(87)90100-2"},{"key":"e_1_2_1_10_1","doi-asserted-by":"publisher","DOI":"10.1007\/BF00248879"},{"key":"e_1_2_1_11_1","first-page":"47","article-title":"Connections between area 3b of the somatosensory cortex and subdivisions of ventroposterior nuclear complex and the anterior pulvinar nucleus in squirrel monkeys","volume":"299","author":"Cusick C. 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