Upper or Lower Motor Neuron Lesion?
Sign: Weakness
Both UMN & LMN lesions have this sign
Atrophy
Lower Motor Neuron Lesion
Decreased Muscle Tone
Lower Motor Neuron Lesion
Clonus
Upper Motor Neuron Lesion
Decreased Reflexes
Lower Motor Neuron Lesion
Fasciculations (contractions of a small # of motor units causing worm-like contractions)
Lower Motor Neuron Lesion
Negative Babinski Sign
Lower Motor Neuron Lesion
No Clonus
Lower Motor Neuron Lesion
Describe the findings of a Lower Motor Neuron Lesion
Muscle Weakness, Atrophy, and Fasciculations Decreased Reflexes & Muscle Tone Negative Babinski Sign, No Clonus
Describe the findings of an Upper Motor Neuron Lesion
Muscle weakness, Clonus, Positive Babinski Sign Increased Reflexes & Muscle Tone No Fasciculations or Atrophy
Increased Muscle Tone
Upper Motor Neuron Lesion
Increased Reflexes
Upper Motor Neuron Lesion
Positive Babinski Sign
Upper Motor Neuron Lesion
spastic motor responses that feature increased muscle tone, hyperactive muscle stretch reflexes, and clonus
Upper Motor Neuron Lesion