Transcallosal Connections of the Cingulum of Man

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Abstract
Introduction EVIDENCE for transcallosal projections of the cingulum to the contralateral striatum has been presented in earlier studies in monkeys.1,2 A striking demonstration of transcallosal connections of the caudate nucleus was obtained in animals which had undergone hemicerebrectomy 19 to 29 months previously.2 Since these reports, confirmation of a crossed cortico-striatal projection has been presented for the cat3 and for the rat, cat, and rabbit.4 The observation that many of the contralateral projection fibers arise in the cingulum was first made in monkeys with surgical ablation of anterior cingulate gyrus and extension of the lesion into the knee of the corpus callosum.1 Collaterals of the cingulum were observed to turn medially and ventrally into the corpus callosum (Fig 1, A), where they formed a dorsal and ventral condensation separated by somewhat lighter-staining bundles of commissural fibers in the core of the corpus

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