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Lower Motor Neuron Lesion
Aka: Lower Motor Neuron Lesion, Lower Motor Neuron Deficit, Lower Motor Neuron
- See Also
- Motor Exam
- Upper Motor Neuron Deficit
- Physiology
- Corticospinal tract (motor, lateral cord) transmits motor signals from the cerebral cortex
- Fibers cross the midline at the Brain Stem and course to the contralateral Muscles
- Motor fibers Synapse in the anterior horn (grey matter of the spinal cord)
- Upper Motor Neurons (UMN) are from the cerebral cortex to the Synapse
- Affect the cerebral cortex, Brainstem and Corticospinal tracts
- Lower Motor Neurons (LMN) are from the Synapse to the Muscle
- Affect the anterior horn (spinal cord), nerve roots, and Peripheral Nerves
- Causes: Examples
- See Muscle Weakness Causes
- Myasthenia Gravis
- Lambert-Eaton Syndrome
- Guillain Barre Syndrome (other autoimmune polyneuropathies)
- Neuropathy
- See Peripheral Neuropathy
- See Symmetric Peripheral Neuropathy
- See Asymmetric Peripheral Neuropathy
- Diabetic Neuropathy
- Peripheral Nerve Injury or Compression Neuropathy (e.g. Carpal Tunnel Syndrome, Lumbar Radiculopathy)
- Signs: Lower Motor Neuron Lesion findings
- Flaccid Paralysis
- Muscular atrophy
- Muscle fasciculations and fibrillations
- Hyporeflexia
- Absent Babinski Reflex