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Widespread Corticothalamic Connectivity Identifies the Inferior Pulvinar as a Central Node in Visual Network
William C Kwan1, Angela Y Fan1,2, Andrea J Romanowski2
1Australian Regenerative Medicine Institute, Monash University, Clayton, VIC 3800, Australia.
The medial pulvinar (PIm) integrates visual and motion signals from across the brain. This study precisely maps its cortical inputs, revealing PIm
Area of Science:
- Neuroscience
- Primate Neuroanatomy
- Visual System Research
Background:
- The medial subdivision of the inferior pulvinar (PIm) is linked to motion processing and visuomotor control.
- Previous mapping of PIm's cortical inputs lacked anatomical specificity due to indirect methods.
Purpose of the Study:
- To precisely map the cortical afferents to the PIm in the common marmoset using MRI-guided, cytoarchitectonically restricted tracer injections.
- To clarify the role of PIm within broader visual and visuomotor networks.
Main Methods:
- Utilized MRI-guided, retrograde tracer injections targeting specific PIm subdivisions in marmosets.
- Systematically analyzed retrogradely labeled neurons across occipital, temporal, parietal, and cingulate cortices.
- Employed semi-quantitative analyses to determine the relative contribution of different cortical regions.
Main Results:
- Identified widespread cortical inputs to PIm, predominantly in layer V, from early/middle visual areas (V1-V6/DM), the middle temporal complex (MT/MTc/MST/FST), and posterior parietal regions (LIP, MIP, VIP, AIP, PFG, OPt).
- Occipital and MT complex provided ~60% of inputs; parietal cortex contributed ~20%.
- Observed additional projections from retrosplenial and posterior cingulate cortices.
Conclusions:
- PIm acts as a central integrative node within distributed visual and visuomotor networks.
- PIm coordinates motion, spatial, and action signals for visually-guided behavior.
- PIm is not merely a visual relay but a key component in cortico-thalamocortical circuits.
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