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Peripheral input pathways to the monkey motor cortex.

H Asanuma, K Larsen, H Yumiya

    Experimental Brain Research
    |February 1, 1980
    PubMed
    Summary
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    Peripheral somatosensory inputs reach the monkey motor cortex primarily via the dorsal column system. Sensory cortex receives inputs through both dorsal column and spinothalamic tracts.

    Area of Science:

    • Neuroscience
    • Somatosensory System
    • Motor Cortex Function

    Background:

    • The monkey motor cortex receives direct peripheral somatosensory inputs from the thalamus.
    • Understanding the precise pathways for these inputs is crucial for motor control research.

    Purpose of the Study:

    • To investigate the neural pathways mediating peripheral somatosensory inputs to the motor and sensory cortices.
    • To differentiate the roles of the dorsal column and spinothalamic tracts in relaying these inputs.

    Main Methods:

    • Stimulation of superficial radial (SR) and deep radial (DR) nerves in monkeys.
    • Recording of evoked potentials in the motor and sensory cortices.
    • Surgical ablation of the sensory cortex and sectioning of the dorsal column and ventrolateral cervical column.

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    Main Results:

    • Evoked potentials in the motor cortex were widespread, while sensory cortex potentials were localized.
    • Sensory cortex ablation reduced, but did not abolish, motor cortex potentials.
    • Dorsal column section significantly reduced motor cortex potentials but only halved sensory cortex potentials.
    • Spinothalamic tract section halved sensory cortex potentials but did not affect motor cortex potentials.

    Conclusions:

    • Direct peripheral inputs to the motor cortex are primarily mediated by the dorsal column system.
    • Peripheral inputs to the sensory cortex are conveyed through both the dorsal column and spinothalamic tract pathways.