UMN vs LMN lesions

Question 1

How are the muscle reflexes affected in someone with UMN lesion?

Answer 1

Increased
Hyperrefexia

Question 2

How are the muscle reflexes affected in someone with LMN lesion?

Answer 2

Decreased
Hyporeflexia

Question 3

How is the tone of the muscles affected in someone with an UMN lesion?

Answer 3

Increased
Hypertonia

Question 4

How is the tone of the muscles affected in someone with an LMN lesion?

Answer 4

Decreased
Hypotonia

Question 5

What does babinski’s sign test for?

Answer 5

Plantar reflex

Question 6

What is a normal babinski’s sign? (negative?

Answer 6

Plantar flexion
(toes pointing down)

Question 7

What is a positive babinski’s sign?
(abnormal)

Answer 7

Extensor plantar response
(toes pointing up)

Question 8

How are muscle contractions affected in an UMN lesion?

Answer 8

Increased muscle contractions
Spastic

Question 9

How are muscle contractions affected in an LMN lesion?

Answer 9

Decreased muscle contractions
Flaccid

Question 10

What type of atrophy can occur in muscles due to an UMN lesion?

Answer 10

Disuse atrophy

Question 11

What type of atrophy can occur in muscles due to a LMN lesion?

Answer 11

Denervation atrophy

Question 12

What is the path of the UMN’s?

Answer 12

Neuron in the brain/brainstem
Axon travels down spinal cord
Innervates alpha and gama motor neurones in ventral horn

Question 13

What is the path of the LMN’s?

Answer 13

They are the alpha and gamma motor neurones in ventral horn
Their axons travel to peripherally innervate muscle

Question 14

How can the muscles be affected in someone with a LMN lesion?

Answer 14

Fasciculations
Severe muscle wasting