Connections of latero-dorsal nucleus of the thalamus. II. Experimental study in Papio papio

Mikol, J; Brion, S; Derome, P; Pommery, J. de; Gallissot, M.C.

doi:10.1016/0006-8993(77)90780-6

Cited by 9 publications

References 18 publications

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A quantitative comparison of the hominoid thalamus: II. Limbic nuclei anterior principalis and lateralis dorsalis

Armstrong

1980

American J Phys Anthropol

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Structures in the limbic system are commonly thought to be similar in form and function in all mammalian brains. In the study reported here, two thalamic limbic nuclei, N. anterior principalis and N. lateralis dorsalis, were compared among a group of extant hominoids. The nuclear volumes, neuronal densities, numbers of neurons per nucleus, and columes of neuronal perikarya were measured. Humans have much larger nuclei but the nuclei constitute a similar proportion of the whole thalamus as found in the other hominoids. Whereas the human limbic nuclei were observed to have a decrease in the densities of nerve cells compared with those of the other hominoids, this difference is less than that found in most other thalamic nuclei. Consequently the estimated number of neurons is much higher for humans. The total number of neurons best separates the human limbic nuclei from those of the other hominoids. This preliminary study suggests that during hominid evolution neurons were preferentially added to the limbic nuclei of the thalamus.

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A quantitative comparison of the hominoid thalamus: II. Limbic nuclei anterior principalis and lateralis dorsalis

Armstrong

1980

American J Phys Anthropol

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Organisation of subcortical pathways for sensory projections to the limbic cortex. I. Subcortical projections to the medial limbic cortex in the rat

Thompson¹,

Robertson²

1987

J of Comparative Neurology

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Subcortical afferent projections to the medial limbic cortex were examined in the rat by the use of retrograde axonal transport of horseradish peroxidase. Small iontophoretic injections of horseradish peroxidase were placed at various locations within the dorsal and ventral cingulate areas, the dorsal agranular and ventral granular divisions of the retrosplenial cortex and the presubiculum. Somata of afferent neurons in the thalamus and basal forebrain were identified by retrograde labeling. Each of the anterior thalamic nuclei was found to project to several limbic cortical areas, although not with equal density. The anterior dorsal nucleus projects primarily to the presubiculum and ventral retrosplenial cortex; the anterior ventral nucleus projects to the retrosplenial cortex and the presubiculum with apparently similar densities; and the anterior medial nucleus projects primarily to the cingulate areas. The projections from the lateral dorsal nucleus to these limbic cortical areas are organized in a loose topographic fashion. The projection to the presubiculum originates in the most dorsal portion of the lateral dorsal nucleus. The projection to the ventral retrosplenial cortex originates in rostral and medial portions of the nucleus, whereas afferents to the dorsal retrosplenial cortex originate in caudal portions of the lateral dorsal nucleus. The projection to the cingulate originates in the ventral portion of the lateral dorsal nucleus. Other projections from the thalamus originate in the intralaminar and midline nuclei, including the central lateral, central dorsal, central medial, paracentral, reuniens, and paraventricular nuclei, and the ventral medial and ventral anterior nuclei. In addition, projections to the medial limbic cortex from the basal forebrain originate in cells of the nucleus of the diagonal band. Projections to the presubiculum also originate in the medial septum. These results are discussed in regard to convergence of sensory and nonsensory information projecting to the limbic cortex and the types of visual and other sensory information that may be relayed to the limbic cortex by these projections.

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Projections from the laterodorsal nucleus of the thalamus to the limbic and visual cortices in the rat

Groen

Wyss

1992

J of Comparative Neurology

138

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The laterodorsal nucleus (LD) of the thalamus is an important source of thalamic afferents to the limbic cortex, but the topography and lamination of these projections has not been investigated in detail. Using the anterograde transport of Phaseolus vulgaris leucoagglutinin and Fluoro-Ruby, the present study demonstrates that in the rat, LD projects to infraradiata, precentral agranular, retrosplenial, visual (area 18b), subicular, and entorhinal cortices. Each subregion of LD has a distinct pattern of terminals within these cortical areas. The rostral part and the dorsalmost part of LD project densely to retrosplenial granular a (Rga) cortex, presubiculum and parasubiculum. Slightly more caudal parts of dorsal LD project primarily to the postsubiculum. More ventral parts of LD project primarily to retrosplenial dysgranular (Rdg) and retrosplenial granular b (Rgb) cortices. The projection of LD to area 18b originates from cells in the caudalmost part of LD. In each cortical region, LD terminals display distinct laminar patterns. In area 18b and the adjacent Rdg cortex, the LD terminal field is in layers I, III, and IV, but in both the Rgb and Rga cortices the terminal field is located predominantly in layer I. In the postsubiculum the LD terminals are distributed to layers I and III/IV and extend into superficial layer V; in the presubiculum and the parasubiculum the LD terminals are only in the deep layers (i.e., layers IV-VI). A small number of LD axons terminate in the deep layers (i.e., layers IV-VI) of the medial entorhinal cortex. These results indicate that each area of LD has a distinct projection to limbic and adjacent neocortex.

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Connections of latero-dorsal nucleus of the thalamus. II. Experimental study in Papio papio

Cited by 9 publications

References 18 publications

A quantitative comparison of the hominoid thalamus: II. Limbic nuclei anterior principalis and lateralis dorsalis

A quantitative comparison of the hominoid thalamus: II. Limbic nuclei anterior principalis and lateralis dorsalis

Organisation of subcortical pathways for sensory projections to the limbic cortex. I. Subcortical projections to the medial limbic cortex in the rat

Projections from the laterodorsal nucleus of the thalamus to the limbic and visual cortices in the rat

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