Question
Which of the following are typically associated with upper motor neuron (UMN) lesions?
| A. |
Atrophy
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| B. |
Fasciculations
|
| C. |
DTR increased
|
| D. |
Rigidity
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Show Answer
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Correct Answer � C
Explanation
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Upper Motor Neuron (UMN) lesions and Lower Motor Neuron (LMN) lesions have distinct characteristics. Let’s review each option in relation to these types of lesions:
Atrophy: Atrophy is typically associated with LMN lesions. While some disuse atrophy can occur with UMN lesions, it is more prominent in LMN lesions.
Fasciculations: Fasciculations are spontaneous contractions of muscle fibers and are typically associated with LMN lesions, not UMN lesions.
Deep Tendon Reflexes (DTR) increased: Increased DTRs or hyperreflexia is a characteristic of UMN lesions.
Rigidity: Associated more with extrapyramidal disorders (e.g., Parkinson’s disease) rather than classic UMN or LMN lesions.
