UMN/LMN Lesions Flashcards

1
Q

Where is the cell body LMN/UMN?

A

LMN - ventral horn spinal cord/cranial nerve nuclei

UMN - cerebral motor cortex or brain stem

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2
Q

Distribution of signs in UMN/LMN lesion?

A

LMN - signs have distribution of peripheral nerve affected

UMN - widespread signs e.g. hemiparesis

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3
Q

Paralysis type in UMN/LMN lesion?

A

LMN - flaccid paralysis (atonia)

UMN - spastic paralysis (increased tone)

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4
Q

LMN signs?

A
Flaccid paralysis
Weakness
Fasciculations (brief spontaneous contraction of muscle fibres causing flicker under skin)
Muscles wasting, atrophy
Hypotonia
Hyporeflexia
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5
Q

UMN Signs?

A

Spastic paralysis
Weakness
No fasciculation/wasting until disuse atrophy
Hypertonia
Hyperreflexia
Clasp knife reflex
Plantar extensor reflex (Babinski’s sign)
Clonus (spasm - repeated, rhythmic contraction)

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6
Q

What signs are indicative of lesions in the extra-pyramidal system?

A

Generation of unwanted, uncontrollable movements, or aberrant reflexes?

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7
Q

Causes of LMN/UMN lesion?

A

LMN - peripheral neuropathy - MND/diabetes, traumatic injury

UMN - stroke, spinal cord injury

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