Motor 6: Upper & Lower Motor Neuron Lesions

Question 1

effect of Upper motor Neurone Lesion on Voluntary (cortex)

Answer 1

Lost

Question 2

effect of Upper motor Neurone Lesion on reflexes

Answer 2

loss of inhibition on gamma motor neurone, leading to:
* Hypertonia
* Hyperreflexia
* Clasp knife effect
* Spastic Paralysis

Question 3

effect of Upper motor Neurone Lesion on muscle structure

Answer 3

• No significant muscle wasting
• No Fasciculation

Question 4

effect of Upper motor Neurone Lesion on electric excitability

Answer 4

Normal:
* Faradic: tetanic Contractions
* Galvanic:normal
* Chronaxie: normal

Question 5

Causes of Upper Motor Neuron Lesion

Answer 5

Cerebrovascular Accidents in posterior Limb of Internal Capsule, leading to Damage to pyramidal & extrapyramidal Tracts

Question 6

effect of Lower motor Neurone Lesion on Voluntary (cortex)

Answer 6

Lost

Question 7

effect of Lower motor Neurone Lesion on inVoluntary (reflexes)

Answer 7

• Lost (Areflexia)

Question 8

effect of Lower motor Neurone Lesion on Muscle structure

Answer 8

• Flaccid Paralysis
• Muscle wasting
• Fasciculation

Question 9

effect of Lower motor Neurone Lesion on Electric Excitability

Answer 9

Not Normal

Question 10

Causes of Lower motor Neurone Lesion

Answer 10

• uncontrolled DM
• Polimyelitis
• Alcoholism

Question 11

Causes of Internal Capsule Lesion

Answer 11

Lenticular Artery Thrombosis/hemorrhage

Question 12

Effect of Internal Capsule lesion

Answer 12

Hemiplegia
Hemianesthesia