Cited by 88Visual perception and processing mechanismsNeuroscience and Neuropharmacology ResearchMultisensory perception and integration

Differential projection patterns of superior and inferior collicular neurons onto posterior paralaminar nuclei of the thalamus surrounding the medial geniculate body in the rat

Linke, Rüdiger·1999·European Journal of Neuroscience

Abstract

The thalamic nuclei at the medial border of the medial geniculate body (i.e. the suprageniculate nucleus, the medial division of the medial geniculate nucleus, the posterior intralaminar nucleus and the peripeduncular nucleus) which relay sensory information to the amygdala are thought to receive convergent input from multiple sites. In order to delineate the organization of these multimodal thalamic nuclei, the locations of superior and inferior collicular neurons projecting to these nuclei were studied by means of retrograde transport methods. Small injections of the tracer Miniruby were made into single paralaminar thalamic nuclei. Injections of Miniruby into the suprageniculate nucleus labelled predominantly neurons in the stratum opticum of the superior colliculus, whereas injections into the medial division of the medial geniculate body, the posterior intralaminar nucleus and the peripeduncular nucleus labelled predominantly neurons in the deep layers of the superior colliculus. These injections also labelled neurons in the inferior colliculus. The majority of retrogradely labelled neurons were found in the external nucleus of the inferior colliculus and here predominantly in layer 2. Injections focused onto the medial division of the medial geniculate body additionally labelled magnocellular neurons in layer 3 of the external nucleus and a few neurons in the central nucleus. More ventrally located injections, focused onto the posterior intralaminar and peripeduncular nucleus, almost exclusively labelled neurons in layer 1 of the external nucleus and the dorsal part of the dorsal nucleus. After injections into the suprageniculate nucleus, only neurons in layer 2 were found. Neurons in the central nucleus of the inferior colliculus were only found after injections that involved the medial division of the medial geniculate body. The present results suggest that, despite a considerable degree of convergence in this thalamic region, each of these thalamic nuclei receives a unique pattern of projections from the superior and inferior colliculi. It appears that the thalamic nuclei may be concerned mainly, but not exclusively, with a single sensory modality, and give rise to parallel multimodal and unimodal pathways to the amygdala.

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Crossref · 10.1046/j.1460-9568.1999.00422.x

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  • Tracing studies in rodents have shown that the PIL receives inputs from sensory regions such as the inferior and superior colliculus, auditory cortex, and spinal cord and projects to socially relevant brain regions including the PVH, lateral septum, MPOA, and medial amygdala.

    “Tracing studies conducted in rodents have provided anatomical support for this theory, demonstrating that the PIL receives inputs from sensory regions such as the inferior and superior colliculus, auditory cortex, and spinal cord (3, 7-10) and projects to socially relevant brain regions including the paraventricular nucleus of the hypothalamus (PVH), the lateral septum, medial preoptic area (MPOA)”

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Authors
Linke, R.
Affiliations
Otto-von-Guericke-Universität Magdeburg (DE)
Corresponding author
Linke, Rüdiger
Venue
European Journal of Neuroscience
Publisher
Wiley
Published
1999-01
Volume
11
Issue
1
Pages
187-203
ISSN
  • 0953-816X (ISSN-L)
  • 1460-9568
OpenAlex
W2012053087
Cited by
88
References
68
Citations by year
2026: 2 · 2025: 1 · 2024: 1 · 2023: 4 · 2021: 2 · 2020: 3 · 2019: 2 · 2018: 3 · 2017: 1 · 2016: 2 · 2015: 2 · 2014: 3 · 2013: 2 · 2012: 1
FWCI
2.58
Type
journal article
Language
en
Open access
closed
Locations
  • European Journal of Neuroscience (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Visual perception and processing mechanisms
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Multisensory perception and integration
Keywords
superior colliculus, inferior colliculus, suprageniculate nucleus, medial geniculate body, amygdala, sensory convergence, thalamocortical connections
MeSH terms
Animals, Biotin, Dextrans, Fluorescent Dyes, Geniculate Bodies, Inferior Colliculi, Male, Microinjections, Neural Pathways, Rhodamines, Stilbamidines, Superior Colliculi, Rats, Sprague-Dawley, Rats, Wistar, Wheat Germ Agglutinin-Horseradish Peroxidase Conjugate, Rats

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