The dual pattern of corticothalamic projection of the primary auditory cortex in macaque monkey
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Acknowledgements
We thank V. Moret, C. Roulin, and F. Tinguely for their technical assistance for histology, J. Corpataux and B. Morandi for animal care and surgical assistance, A. Gaillard and B. Aebischer for mechanics and electronics, L. Monney for computer sciences. Grant Sponsors: Swiss National Science Foundation, grants No 31-43422.95 and 31-61857.00, National Center of Competence in Research (NCCR) in Neurosciences.
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2.32 - Primary Auditory Cortex and the Thalamo-Cortico-Thalamic Circuitry I. Anatomy
2020, The Senses: A Comprehensive Reference: Volume 1-7, Second EditionAuditory thalamic circuits and GABA<inf>A</inf> receptor function: Putative mechanisms in tinnitus pathology
2017, Hearing ResearchCitation Excerpt :Additional pathways from sites known to show tinnitus-related changes and that project to thalamus may also be involved. For example, there is a large and heterogeneous pathway emanating from the auditory cortex onto MGB neurons, part of which sends branches to the thalamic reticular nucleus (Kimura et al., 2005; Llano & Sherman, 2008, 2009; Ojima, 1994; Rouiller & Durif, 2004) and there are direct projections from the amygdala to neurons in the auditory sector of the thalamic reticular nucleus (Zikopoulos & Barbas, 2012). Both of these pathways involve the thalamic reticular nucleus, and therefore both have the potential to alter the balance of excitation and inhibition in the MGB, but their specific contributions in tinnitus have not yet been specifically explored.
Anatomic organization of the auditory cortex
2015, Handbook of Clinical NeurologyCitation Excerpt :In addition to inputs from the MGB to cortex, there is a dense system of descending (corticothalamic) projections originating from neurons in layers V and VI of all areas of auditory cortex and targeting all divisions of the MGB. The descending projections target the MGB via a direct system involving both small and giant axon terminals, and an indirect system that sends collateral inputs to the posterior (auditory) aspect of the thalamic reticular nucleus (TRN) (Bajo et al., 1995; Crabtree, 1998; Rouiller and Welker, 2000; He, 2003; Rouiller and Durif, 2004; Hackett, 2007b; Zhang et al., 2008). Both systems project topographically to the MGB, where their effects on activity vary by division.
Emerging from an unresponsive wakefulness syndrome: Brain plasticity has to cross a threshold level
2013, Neuroscience and Biobehavioral ReviewsCitation Excerpt :Corticothalamic projections comprise nearly 50% of the synaptic input into thalamic sensory neurons, outnumber the corresponding thalamocortical projections, and regulate sensory information processing at the level of the thalamus (Jones, 2002). The massive reciprocal feedback from the cortex to the thalamus (Deschenes et al., 1998; Winer et al., 2001; Rouiller and Durif, 2004) suggests that the central processing of sensory information is far more intricate than the traditional notion of feed-forward processing. During brain development, corticothalamic and thalamocortical projections guide each other to reach their specific targets (Grant et al., 2012; Deck et al., 2013), and the cerebral cortex provides feedback to the thalamus via the projections of two distinct classes of pyramidal cells located in different layers.
Triadic synaptic interactions of large corticothalamic terminals in non-lemniscal thalamic nuclei of the cat auditory system
2011, Hearing ResearchCitation Excerpt :Target thalamic nuclei of large CT terminals include almost all non-principal nuclei (see Rouiller and Welker, 2000 for review), such as the pulvinar and lateral-posterior nucleus in the visual system, the posterior nucleus in the somatosensory system, the dorsal nucleus of the medial geniculate complex (dMGC) in the auditory system, and others. The morphological characteristics of the two distinct types of descending CT projections have been characterized by terminal size, aggregation pattern of multiple terminals, and the extent of their distribution in major sensory systems of various animal species (Robson and Hall, 1977; Ogren and Hendrickson, 1979; Hoogland et al., 1987; Rouiller and de Ribaupierre, 1990; Rouiller and Welker, 1991; Rouiller et al., 1991; Kuroda et al., 1993; Ojima, 1994; Rockland, 1994; Bourassa and Deschênes, 1995; Bourassa et al., 1995; Bajo et al., 1995; Vidnyánszky et al., 1996; Ojima et al., 1996; Winer et al., 1999; Guillery et al., 2001; Li et al., 2003b; Rouiller and Durif, 2004; Hazama et al., 2004; Kimura et al., 2005; Zikopoulos and Barbas, 2006), and also for the motor system (Rouiller et al., 1998; Kakei et al., 2001). Findings that layer 5-derived CT terminals are larger than layer 6-derived CT terminals have been confirmed in most cortical areas in many animal species.
Multisensory anatomical pathways
2009, Hearing Research