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Primate models of postural disorders.

Advances in Neurology

|January 1, 1975

Summary

This summary is machine-generated.

Lesions in the dorsal columns and pyramidal tracts impair limb movements and reactions. Reduced fusimotor activity in muscle spindles contributes to hypotonia after cerebellar, cortical, or pyramidal damage.

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Area of Science:

Neuroscience
Motor Control
Sensory-Motor Integration

Background:

Dorsal column lesions in monkeys cause severe forelimb movement and orienting defects.
Hindlimb function is impaired if the lateral column pathway (Morin's tract) is interrupted.
Cerebellar ablations lead to postural and movement disorders, including hypotonia.

Purpose of the Study:

To investigate the role of specific neural pathways in motor control and sensory-motor reactions.
To elucidate the mechanisms underlying hypotonia following lesions in different brain regions.
To determine the contribution of fusimotor activity to motor deficits.

Main Methods:

Surgical lesions were performed in the dorsal columns, cerebellum, precentral cortex, and medullary pyramids of monkeys.

Related Experiment Videos

Observed effects on forelimb and hindlimb movements, postural control, and orienting reactions.

Recorded responses of muscle spindle afferents and assessed fusimotor activity.

Main Results:

Dorsal column lesions severely affected forelimb spatial and contactual orienting reactions.
Cerebellar lesions caused hypotonia linked to decreased fusimotor activity.
Precentral cortical and pyramidal tract lesions resulted in hypotonic paresis with depressed spindle afferent responses, implicating reduced fusimotor innervation.

Conclusions:

The dorsal columns serve as a crucial afferent pathway for limb contactual orientation.
The pyramidal tracts function as an efferent pathway for oriented limb reactions.
Hypotonia following cerebellar, cortical, or pyramidal lesions is partly due to depressed fusimotor innervation of muscle spindles.