lower motor neuron


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Related to lower motor neuron: corticospinal tract, Lower motor neuron disease, Lower Motor Neuron Lesion

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 ?
Two years later, he exhibited a complete left lower motor neuron facial nerve palsy.
The term motor neuron disease was introduced by Brain (1962) in recognition of the relationship between progressive muscular atrophy, amyotrophic lateral sclerosis, and progressive bulbar palsy, as shown by the differing patterns of involvement of upper and lower motor neurons and muscle wasting in these syndromes (Swash, 2000; Swash & Desai, 2000).
ALS is a fatal progressive degenerative disease resulting in relentlessly progressive weakness and wasting of voluntary muscles, affecting a combination of the upper motor neurons in the motor cortex and the lower motor neurons in the brainstem and spinal cord.
Upper motor neurons direct the lower motor neurons to produce movements such as walking or chewing.
ALS is a progressive neurodegenerative disease that usually attacks both upper and lower motor neurons and causes degeneration throughout the brain and spinal cord.
ALS, the most common motor neuron disease, results from progressive degeneration of both upper and lower motor neurons and is usually fatal within 5 years of symptom onset.

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