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عمومی::
نورون حرکتی
UMN, upper motor neuron; LMN, lower motor neuron.
This is important, for motor neurons above the level of this synapse (connecting the cerebral cortex and anterior horn) are termed upper motor neurons (UMN), whereas those beyond this level (the peripheral nerve neurons) are termed lower motor neurons (LMN).
These terms are actually somewhat misleading and probably would better have been phrased as first order motor neurons (UMN) and second order motor neurons (LMN), as either of these categories may have axons that lie in the upper or lower part of the body.
Upper and lower motor neuron injuries result in different clinical signs.
Amyotrophic lateral sclerosis (Fig. 18A) is characterized by a combination of upper and lower motor neuron signs-muscle weakness, atrophy, fibrillations, and fasciculations combined with hyperreflexia.
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