lower motor neuron


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low·er mo·tor neu·ron

clinical term used to indicate the final motor neurons with axons that innervate the skeletal muscles; distinguished from upper motor neurons of the motor cortex that contribute to the corticospinal tract.
See also: motor neuron.

low·er mo·tor neu·ron

(lō'ĕr mō'tŏr nūr'on)
The final motor neurons that innervate skeletal muscles; distinguished from upper motor neurons of the motor cortex that contribute to the pyramidal or corticospinal tract.
See also: motor neuron

lower motor neuron

A peripheral motor neuron that originates in the ventral horns of the gray matter of the spinal cord and terminates in skeletal muscles. Lesions of these neurons produce flaccid paralysis of the muscles they innervate. Synonym: lower motoneuron
See also: neuron
References in periodicals archive ?
It is common for botox injections to be recommended for this particular aspect of lower motor neuron involvement.
ALS is also called a motor neuron disease, which is a general term that refers to a group of disorders that also includes the spinal muscular atrophies, genetic diseases of lower motor neurons.
EMG changes in the rectus abdominis (RA) display an effect similar to those in paraspinal muscles with respect to the function of lower motor neurons in the thoracic spinal cord.
Upper versus lower motor neuron weakness Upper motor neuron weakness Lower motor neuron weakness Muscle weakness Muscle weakness Less atrophy of muscles (may be Atrophy of muscles disuse) Increased tone, spasticity Low muscle tone Increased deep tendon reflexes Diminished or absent deep tendon reflexes No fasciculation Fasciculation Hemiplegic, quadriplegic or Specific distribution of paraplegic distribution of weakness, i.
He was then noted to have a complete left lower motor neuron facial palsy and a loss of sensation to touch and pain over the mandibular nerve distribution of the skin.
It is a degenerative disorder of the upper and lower motor neurons.
sup][7] SBMA is an X-linked lower motor neuron disease characterized by slowly progressive weakness and atrophy of the bulbar, facial, and limb muscles.
Physical signs include both upper motor neuron and lower motor neuron findings.
Clinical electrophysiological studies have shown that neurogenic injury could be detected in paretic limbs of patients with stroke, suggesting that there is lower motor neuron injury.
Physical signs of this disorder encompass both, the upper and the lower motor neuron findings.
sup][8] The purpose of the present study was to use F waves to investigate the pathophysiological changes in segmental motoneuronal excitability in ALS and interpret these F wave abnormalities in the context of upper and lower motor neuron (UMN and LMN) dysfunction.
11%) presented with ipsilateral Lower Motor Neuron (LMN) facial palsy.

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