Upper motor neuron lesion is characterized by:
Weakness and spasticity
Fasciculation's
Rigidity
Localized muscle astrophy
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
Amyotrophic Lateral Sclerosis and other motor neuron diseases