Upper motor neuron lesion is characterized by:
UMN LMN Pyramidal & Extra pyramidal tracts involved Motor neurone of spinal cord & Neurons of cranial nerve nuclei are involved Group of Muscle affected Single Muscle affected Tone - | Lost Power - Normal or no loss Lost Superficial & deep reflexes lost Lost Babinski's sign present Absent Clonus present Absent Clasp knife reflex present Absent Spasticity Absent
Weakness and spasticity
Fasciculation's
Rigidity
Localized muscle astrophy
Amyotrophic Lateral Sclerosis and other motor neuron diseases