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Questions and Answers
What is the main difference in muscle tone between upper motor neuron lesion (UMNL) and lower motor neuron lesion (LMNL)?
What is the main difference in muscle tone between upper motor neuron lesion (UMNL) and lower motor neuron lesion (LMNL)?
Which of the following is a possible etiology of upper motor neuron lesion (UMNL)?
Which of the following is a possible etiology of upper motor neuron lesion (UMNL)?
Which region may be affected to produce right hemiparesis?
Which region may be affected to produce right hemiparesis?
What is the main difference in muscle atrophy between upper motor neuron lesion (UMNL) and lower motor neuron lesion (LMNL)?
What is the main difference in muscle atrophy between upper motor neuron lesion (UMNL) and lower motor neuron lesion (LMNL)?
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What is a characteristic reflex associated with upper motor neuron lesion (UMNL)?
What is a characteristic reflex associated with upper motor neuron lesion (UMNL)?
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What is the main difference in muscle tone between upper motor neuron lesion (UMNL) and lower motor neuron lesion (LMNL)?
What is the main difference in muscle tone between upper motor neuron lesion (UMNL) and lower motor neuron lesion (LMNL)?
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Which region may produce right hemiparesis if affected?
Which region may produce right hemiparesis if affected?
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What is a possible etiology of upper motor neuron lesion (UMNL)?
What is a possible etiology of upper motor neuron lesion (UMNL)?
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Which reflex is typically present in upper motor neuron lesion (UMNL)?
Which reflex is typically present in upper motor neuron lesion (UMNL)?
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What is a characteristic clinical feature of upper motor neuron lesion (UMNL)?
What is a characteristic clinical feature of upper motor neuron lesion (UMNL)?
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Study Notes
Muscle Tone Differences
- Upper motor neuron lesions (UMNL) typically cause increased muscle tone, characterized by spasticity.
- Lower motor neuron lesions (LMNL) result in decreased muscle tone, leading to flaccidity.
Etiology of Upper Motor Neuron Lesion
- Possible etiologies of UMNL include strokes, traumatic brain injuries, tumors, and neurodegenerative diseases.
Hemiparesis
- Right hemiparesis may arise from lesions in the left hemisphere of the brain, affecting motor control on the opposite side of the body.
Muscle Atrophy Differences
- Muscle atrophy in UMNL is usually mild or absent due to preserved innervation; however, LMNL shows significant atrophy due to denervation of muscles.
Reflex Characteristics
- A characteristic reflex in UMNL is the Babinski sign, indicating the presence of upper motor neuron damage.
- Deep tendon reflexes can be exaggerated in UMNL, whereas they are diminished or absent in LMNL.
Clinical Features of Upper Motor Neuron Lesion
- Common clinical features of UMNL include weakness, spasticity, and exaggerated reflexes, along with possible clonus and loss of fine motor control.
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Description
Test your knowledge of neuromuscular disorders with this quiz. Learn about weakness, hypotonia, floppy infant, upper motor neuron dysfunction, and lower motor neuron function.
