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Thalamic afferents emphasize the different functions of macaque precuneate areas
Michela Gamberini1, Lauretta Passarelli1, Daniele Impieri1
1Department of Biomedical and Neuromotor Sciences, University of Bologna, 40126, Bologna, Italy.
Brain Structure & Function
|February 21, 2020
Summary
This study reveals distinct thalamic connections to the precuneus in macaques. Area PGm integrates visual, motor, and limbic inputs, suggesting a role in spatial cognition, while areas 31 and PEci focus on sensorimotor functions.
Area of Science:
- Neuroscience
- Primate Brain Research
- Cortical Connectivity
Background:
- The precuneus is a key brain region involved in various cognitive functions.
- Understanding its connectivity with the thalamus is crucial for deciphering its functional roles.
Purpose of the Study:
- To investigate the specific thalamic afferents to different cytoarchitectural areas within the macaque precuneus.
- To elucidate the functional implications of these distinct connectivity patterns.
Main Methods:
- Utilized retrograde fluorescent neuronal tracers in four male macaques (Macaca fascicularis).
- Performed injections into specific precuneate areas: PGm, 31, and PEci.
- Analyzed thalamic inputs to these cortical areas.
Main Results:
- All studied precuneate areas receive input from posterior, medial, lateral, and intralaminar thalamic regions.
- Area PGm shows strong connections with pulvinar nuclei (visual/association) and receives limbic afferents (lateral dorsal nucleus).
- Areas 31 and PEci receive input from the oral pulvinar division and lateral thalamus (motor), with PEci also receiving somatosensory input (ventral posterior lateral nucleus).
Conclusions:
- Area PGm integrates visual, motor, and limbic information, supporting its role in spatial cognition and navigation.
- Dorsal precuneate areas (31, PEci) are primarily involved in sensorimotor functions, similar to adjacent parietal cortex areas.
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