Lower motor neuron syndrome is a group of clinical syndromes characterized by muscle atrophy and weakness and diminished tendon reflexes without sensory deficits.
The main responsible lesion sites for lower motor neuron syndrome are the anterior horn of the spinal cord, the anterior roots, or the motor nerves. There are a number of etiologic factors contributing to the disease, including two major categories: hereditary and acquired.
Hereditary forms include spinal muscular atrophy, Kennedy’s disease, and distal hereditary motor neuropathies; acquired forms include sporadic flail arm/flail leg motor neuron disease, chronic Guillain-Barre syndrome with purely motor variants, and multifocal motor neuropathies.
Lower motor neuron syndrome is characterized by muscle atrophy, muscle weakness, and decreased tendon reflexes without sensory involvement. Any injury to the pathway from the distal motor nerve to the anterior horn cells can lead to lower motor neuron syndrome. Neuromuscular junction disorders and muscle disorders can sometimes be confused with lower motor neuron syndrome and require careful differentiation.
The clinical manifestations and causes of lower motor neuron syndrome are complex and require a comprehensive diagnosis by a specialized neurologist. If you experience any discomfort, it is recommended that you seek medical attention as soon as possible.