flaccidity

UMN LMN
Anatomy Physiology

Lesions of Upper Motor Neurons and Lower Motor Neurons

Upper Motor Neurones (UMN), Lower Motor Neurone (LMN) and their Lesions All the neurons contributing to the pyramidal and extrapyramidal systems should be called upper motor neurons (UMN). The anterior horn cells and the related neurons in the motor nuclei of some cranial nerves are called lower motor neurons (LMN). Axons of these cells give […]

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