Why is spastic cerebral palsy caused by lesion in pyramidal tract?

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Upper motor neuron (UMN) lesions are often associated with specific symptoms, including the Babinski sign and loss of superficial reflexes. However, spasticity typically requires involvement of extrapyramidal motor tracts, such as the reticulospinal tract. The discussion highlights a potential confusion regarding spastic cerebral palsy being classified as pyramidal, while non-spastic forms are categorized as extrapyramidal. Clarification is sought on terminology: "plegia" refers to complete paralysis, "diplegia" indicates more severe impairment in the lower limbs compared to the upper limbs, which raises questions about its distinction from paraplegia. "Quadriplegia" involves paralysis of all four limbs, with a query about whether upper limbs are more affected than lower limbs.
sameeralord
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Hello everyone,

The way I remember upper motor neuron lesions. I always thought a singular lesion in pyramidal tract would only cause Babiniski sign and loss of superficial reflexes. For a UMN to cause spasticty it must affect extra pyramidal motor tracts such as reticulospinal tract.

But I just read in this website spastic cerbral palsy is pyramidal and non spastic is extrapyramidal. How can that be?

Also did I understand these terms right

Plegia : Complete paralysis.
Diplegia: Lower Limbs affected more than Upper Limb . Isn't this same as paraplegia?
Quadriplgia: All 4 limbs affected. Are UL more affected than LL.Thank you :smile:
 
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