lower motor neuron

(redirected from Lower motor neurons)
Also found in: Encyclopedia.

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 ?
AW may be originated from upper or lower motor neuron lesions, spinal cord pathologies, neuromuscular junctions and muscle diseases1 (Table-I).
8) Electrophysiologic studies can be helpful in identifying active denervation of lower motor neurons.
Neurogenic changes based on electromyography (EMG) of the rectus abdominis (RA) muscles are regarded as evidence of lesions in lower motor neurons (LMNs) of the thoracic spinal cord in amyotrophic lateral sclerosis (ALS).
Pathologically, ALS is characterized by extensive loss of lower motor neurons in the spinal cord and brain stem, atrophy of ventral roots, degeneration of upper motor neurons in the motor cortex and corticospinal tract, somatic and axonal inclusions of aberrant neurofilament proteins, and reactive astrocytosis.
Following a thoracolumbar disc herniation, this may clinically be characterized by systemic signs of toxemia, a flaccid abdomen, the level of 'cut-off' of the cutaneous trunci reflex response migrating cranially, a shift from upper motor neuron to lower motor neuron signs in the rear limbs, progressive involvement of the forelimbs and eventually respiratory paralysis and death.
Trauma at these levels or disruption of the lower motor neurons (LMNs) is contraindicated for phrenic nerve pacing.
The UMNs project to and synapse on lower motor neurons in the spinal cord.
ALS is a neuro-degenerative disease that leads to muscle weakness and atrophy throughout the body as a result of the degeneration of both upper and lower motor neurons, the nerve cells in the central nervous system responsible for voluntary muscle movement.
BBs have a predilection for the lumbar cord as opposed to thoracic and cervical sections and are present in greater numbers in the lower motor neurons of patients with an associated dementia [10,11].
ALS is a neurodegenerative disease that usually attacks both upper and lower motor neurons and causes degeneration throughout the brain and spinal cord, according to the ALS Association Web site.
The upper motor neurons originate in the brain and brainstem, and the lower motor neurons arise from the spinal cord.
MNDs involving the upper and lower motor neurons are heterogeneous group of syndromes with various clinical presentations, most with poor prognosis.

Full browser ?