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HRP injections covered or invaded areas along the rhinal fissure from about the level of the middle cerebral artery to the posterior end of the fissure. The most anterior injection labeled a few cells in the mediodorsal nucleus. More posterior injections labeled neurons in the basal portion of the nucleus ventralis medialis, thus suggesting that this cortical region constitutes the rat's gustatory (insular) cortex. We consider the cortex situated posterior to the gustatory cortex in and above the rhinal sulcus as the core region of the rat's (associative) insular cortex, as this cortex receives afferents from the regions of and between the nuclei suprageniculatus and geniculatus medialis, pars magnocellularis. It includes parts of the cortex termed perirhinal in other studies. The cortex dorsal and posterior to the insular cortex we consider auditory cortex, as it receives afferents from the principal part of the medial geniculate nucleus, and the cortex ventral to the insular cortex (below the fundus of the rhinal sulcus) we consider to constitute the pre\u2010piriform cortex, which is athalamic. The posterior part of the perirhinal cortex (area 35) receives afferents from nonspecific thalamic nuclei (midline nuclei).<\/jats:p>\n                  <jats:p>Cortical afferents to the injection loci arise from a number of regions, above all from regions of the medial and sulcal prefrontal cortex. Those injections confined to the projection cortex of the suprageniculate\u2010magno\u2010cellular medial geniculate nuclear complex also led to labeling in contra\u2010lateral prefrontal regions, particularly in area 25 (infralimbic region).<\/jats:p>\n                  <jats:p>\n                    A comparison of our results with those on the insular cortex of cats and monkeys suggests that on the basis of thalamocortical connections, topographical relations, and involvements of neurons in information processing and overt behavior, the insular cortex has to be regarded as a heterogeneous region which may be separated into\n                    <jats:italic>prefrontal insular, gustatory<\/jats:italic>\n                    (somato\u2010sensory) insular, and\n                    <jats:italic>associative insular<\/jats:italic>\n                    portions.\n                  <\/jats:p>","DOI":"10.1002\/cne.902150203","type":"journal-article","created":{"date-parts":[[2004,12,28]],"date-time":"2004-12-28T15:06:08Z","timestamp":1104246368000},"page":"135-153","source":"Crossref","is-referenced-by-count":116,"title":["Cortical and thalamic afferent connections of the insular and adjacent cortex of the rat"],"prefix":"10.1002","volume":"215","author":[{"given":"W. 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