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 ?
Lower motor neuron (motor unit) disease is a frequently encountered complaint in Australian dogs and cats.
Early-onset, aggressive jALS presentations and rapid disease course, with progressive spastic gait, dysarthria, facial muscle involvement, and lower motor neuron dysfunction, are associated with mutations in the fused-in-sarcoma gene (FUS or ALS6).
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.
Pure lower motor neuron (LMN) bulbar signs, including tongue amyotrophy or fasciculation, or neurogenic damages of EMG in tongue, sternocleidomastoid or upper trapezius muscles,[sup][12],[13] were more common in IBP compared to PBP (IBP, 42%; PBP, 20%; P = 0.008).
Neurological examination revealed unilateral lower motor neuron paresis of right facial nerve.
[2.] Jayesh sheth, Harsh patel, Sanjiv Mehta, Stuti tewan and frenny seth: clinical and molecular characterization of patients with gross hypotonia and impaired lower motor neuron function; Indian pediatr 2013; 50:591-593.
Spinal muscular atrophy (SMA) is an autosomal-recessive genetic disorder characterized by lower motor neuron loss and progressive muscle weakness.
With few exceptions, motor weakness fits into either an upper motor neuron or lower motor neuron pattern (Table 1).
(10) The human motor unit consists of a lower motor neuron and its cell body in the ventral horn of the spinal cord, its motor axon, and the muscle fibers innervated by that neuron.
The cause of death was amyotrophic lateral sclerosis, also known as Lou Gehrig's disease, and lower motor neuron syndrome, which attacks nerve cells in the brain and spinal cord.
Examination revealed a complete left lower motor neuron facial palsy; the other cranial nerves were intact.
Idiopathic MND is sometimes used to describe all primary degenerative lower motor neuron and all upper motor neuron disorders (Swash, 2000).

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