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What is UMN vs LMN Lesion Differences about?
Upper motor neurons (UMN) are neurons in the pyramidal and extrapyramidal systems including the cerebral cortex that contribute to motor function. Lower motor neurons (LMN) are the anterior horn cells and motor nuclei neurons that transmit signals from higher centers to target organs. Signs of UMN lesions include weakness, increased tone and reflexes, and positive Babinski sign. Signs of LMN lesions include flaccid paralysis, muscle atrophy, fasciculations, decreased reflexes, and reaction of degeneration.
- Author
- shahzeb
- Language
- EN