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Glutamate released from the upper motor neurons triggers depolarization in the lower motor neurons in the anterior grey column, which in turn causes an action potential to propagate the length of the axon to the neuromuscular junction where acetylcholine is released to carry the signal across the synaptic cleft to the postsynaptic receptors of the ...
6.2 Upper Motor Neuron Syndrome. Damage to any part of the motor system hierarchy above the level of alpha motor neurons (not including the side loops) results in a set of symptoms termed the upper motor neuron syndrome. Some of these symptoms are opposite of those of lower motor neuron disorders.