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Cerebellar Modulation of Cortically Evoked Complex Movements in Rats
Riccardo Viaro1,2, Laura Bonazzi1, Emma Maggiolini2
1Department of Biomedical and Specialty Surgical Sciences, Section of Human Physiology, University of Ferrara, Ferrara, Italy.
Cerebral Cortex (New York, N.Y. : 1991)
|June 23, 2016
Summary
Cerebellar input is vital for motor cortex function. Lesioning deep cerebellar nuclei impaired rat forelimb movements, altering kinematics and task performance, highlighting the cerebellum's role in motor cortex output.
Area of Science:
- Neuroscience
- Motor Control
- Cerebellar Function
Background:
- Intracortical microstimulation (ICMS) of the motor cortex (M1) elicits movements.
- The deep cerebellar nuclei (DCN) are key subcortical structures involved in motor control.
- The precise role of DCN input to M1 in ICMS-evoked movements and motor skill is not fully understood.
Purpose of the Study:
- To investigate the necessity of subcortical cerebellar input for M1 output.
- To evaluate the impact of DCN lesions on ICMS-evoked movements and motor skill performance in rats.
Main Methods:
- Bilateral lesions of the deep cerebellar nuclei were created in rats.
- Intracortical microstimulation (ICMS) was delivered to the motor cortex (M1) using long- and short-train durations.
- Evoked movements were analyzed for occurrence, kinematic variables, and cortical representation.
- Motor skill performance in a reaching/grasping task was assessed.
Main Results:
- DCN lesions significantly reduced the occurrence of distal forelimb movements and altered proximal forelimb movements.
- Classifiable movements were evoked from different cortical regions, and kinematic variables were significantly affected post-lesion.
- Movement workspace shrunk, and reaching/grasping task performance deteriorated after DCN lesions.
- Threshold currents and the overall size of M1 forelimb representation remained unchanged.
Conclusions:
- Subcortical cerebellar input via the motor thalamus is crucial for the expression of basic functional features of the motor cortex.
- The cerebellum shapes the quality and precision of M1 output, rather than determining the overall extent of M1 representation or stimulation thresholds.
- These findings underscore the integrated nature of motor control involving cortical and subcortical pathways.
