Upper motor neuron lesions cause hyper-reflexia by removing descending inhibition
Is it true that upper motor neuron lesions cause hyper-reflexia by removing descending inhibition?
Yes. Upper motor neuron lesions cause hyper-reflexia and spasticity primarily by interrupting descending pathways and removing normal inhibitory influences on spinal circuits.
Verdict: SUPPORTED · 3 sources for, 0 against · Last checked
The retrieved literature consistently supports the physiological mechanism that upper motor neuron lesions and spinal cord injuries disrupt descending control, leading to a loss of inhibitory inputs (such as GABAergic or general synaptic inhibition) and resulting in hyperreflexia and spasticity.
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B, C., T, Y., Z, L., F, S., Z, M., & W, Z. (2025). Pathophysiology and Management Strategies for Post-Stroke Spasticity: An Update Review.. doi.org. https://doi.org/10.3390/ijms26010406
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KE, H. & JW, G. (2022). Ionic Plasticity: Common Mechanistic Underpinnings of Pathology in Spinal Cord Injury and the Brain.. doi.org. https://doi.org/10.3390/cells11182910
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H, G., ZY, Z., ZX, D., XA, M., YY, W., JS, R., & XX, D. (2025). Mechanisms of Different Motor Neurons in the Occurrence of Spasticity After Spinal Cord Injury: A Narrative Review.. doi.org. https://doi.org/10.3390/ijms26115162
What does the evidence say?
The retrieved literature consistently supports the physiological mechanism that upper motor neuron lesions and spinal cord injuries disrupt descending control, leading to a loss of inhibitory inputs (such as GABAergic or general synaptic inhibition) and resulting in hyperreflexia and spasticity.
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