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A member asked:
Why does an upper motor neuron lesion cause a positive babinski sign?
A doctor has provided 1 answer
Extensor respons: The presence of a Babinski sign suggests an upper motor neuron lesion, although in infants the presence of the dorsiflexion of the great toe with plantar stimulation can be normal. Simplifying, it's thought by some it may be related to the difference between the anatomical flexors behaving differently, more as extensors. Medicine Decoded has a reasonable explanation of this.
Answered 2/22/2017
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