Distinguishing Upper vs Lower Motor Neuron Lesions

Understanding Motor Neuron Lesions

Motor neuron lesions are categorized into upper motor neuron (UMN) and lower motor neuron (LMN) lesions. Understanding the differences is critical for accurate diagnosis and treatment.

Key Differences Between UMN and LMN Lesions

Upper Motor Neuron Lesions

• Spastic paralysis
• Hyperreflexia
• Babinski sign positive
• Muscle weakness without atrophy

Lower Motor Neuron Lesions

• Flaccid paralysis
• Hyporeflexia or areflexia
• Muscle atrophy and fasciculations
• Absent Babinski sign

Clinical Manifestations

The clinical presentation of UMN and LMN lesions depends on the site and severity of the damage.

Diagnosis and Management

Diagnostic techniques include neurological exams, electromyography, and imaging studies. Management depends on the underlying cause and may involve rehabilitation and pharmacological intervention.