upper motor neurone

upper motor neurone

; UMN central nervous system motor neurones; extend from cerebral motor cortex to ventral horn of spinal cord (Table 1)
Table 1: Effects of damage to upper and lower motor neurones
Upper motor neurone lesionLower motor neurone lesion
ParalysisSpastic-type contractureFlaccid-type contractures may develop
Tendon reflexesExaggerated; hyperreflexiaReduced/absent; hyporeflexia
Plantar responseExtensor (Babinski's sign positive)Flexor (= normal; Babinski's sign negative)
Extraneous muscle activityNo fasciculations/fibrillationsFasciculations and fibrillations
References in periodicals archive ?
Presenting complaints are the result of upper motor neurone degeneration (hyper-reflexia, spasticity) or lower motor neurone degeneration (weakness, atrophy and fasciculations), and the diagnosis rests on documenting features of both, as well as the progressive nature of the disease (3).

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