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On the basis of the resulting pattern of retrogradely labeled neurons in the cortex, different cortical areas and fields were defined. Two secondary areas located ventrocaudally (Te2) and ventrally (Te3) to the primary auditory area (Te1) were delineated. The primary auditory area was subdivided into a posterior (Te1.p), a medial (Te1.m), and an anterior (Te1.a) auditory field. In addition, we outlined an area located rostrally to the auditory areas comprising a part of the secondary somatosensory cortex, as well as a dorsal belt surrounding dorsally the auditory areas.<\/jats:p><jats:p>The following basic patterns of corticocollicular projections are revealed: (1) layers 2 and 3 of the dorsal cortex of the IC (DC2, DC3) are differentially innervated by the primary auditory fields (Te1.p and Te1.a project bilaterally to DC2, while Te1.m projects bilaterally and in topographical order to DC3); cells in Te1.m, arranged in caudal to rostral sequence, project to corresponding loci in DC3 arranged from dorsolateral to ventromedial; (2) the fibrocellular capsule of the IC, comprising layer 1 of the dorsal and external cortex of the IC, receives input from the secondary auditory area Te2; (3) layers 2 and 3 of the external cortex of the IC are only weakly innervated by the primary and secondary auditory cortex; (4) the intercollicular zone receives its major input from the secondary auditory area Te3, the secondary somatosensory cortex, and the dorsal belt; and (5) finally, the central nucleus of the IC receives no input from the temporal cortex at all.<\/jats:p><jats:p>Our results demonstrate that the corticocollicular projections are highly organized. These pathways may modulate auditory processing in different functional circuits of the inferior colliculus.<\/jats:p>","DOI":"10.1002\/cne.903040108","type":"journal-article","created":{"date-parts":[[2005,1,1]],"date-time":"2005-01-01T19:45:45Z","timestamp":1104608745000},"page":"103-122","source":"Crossref","is-referenced-by-count":166,"title":["Topography of projections from the auditory cortex to the inferior colliculus in the rat"],"prefix":"10.1002","volume":"304","author":[{"given":"Horst","family":"Herbert","sequence":"first","affiliation":[]},{"given":"Andreas","family":"Aschoff","sequence":"additional","affiliation":[]},{"given":"Joachim","family":"Ostwald","sequence":"additional","affiliation":[]}],"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.1978.41.4.837"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/cne.901960104"},{"key":"e_1_2_1_4_1","doi-asserted-by":"publisher","DOI":"10.1007\/BF01900389"},{"key":"e_1_2_1_5_1","doi-asserted-by":"publisher","DOI":"10.1002\/cne.901910310"},{"key":"e_1_2_1_6_1","doi-asserted-by":"publisher","DOI":"10.1002\/cne.902580313"},{"key":"e_1_2_1_7_1","doi-asserted-by":"publisher","DOI":"10.1007\/BF00237663"},{"key":"e_1_2_1_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/0006-8993(78)90858-2"},{"key":"e_1_2_1_9_1","doi-asserted-by":"crossref","first-page":"705","DOI":"10.1152\/jn.1978.41.3.705","article-title":"Effects of bilateral auditory cortex ablation on behavior and unit activity in rat inferior colliculus during differential conditioning","volume":"41","author":"Birt D.","year":"1978","journal-title":"J. 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