<prompt> Upper motor neuron lesion is characterized by:Weakness and spasticityFasciculationsRigidityLocalized muscle astrophy  <response>: 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 Babinskis sign present Absent Clonus present Absent Clasp knife reflex present Absent Spasticity Absent 