Lesions of the motor pathway

Question 1

1) On inspection of an UMN lesion, what would be seen?
2) On inspection of a LMN lesion, what would be seen?
3) On inspection of a NMJ lesion, what would be seen?
4) On inspection of a muscle lesion, what would be seen?

Answer 1

1) Normal
2) Wasting and fasciculation
3) Normal
4) Wasting or hypertrophy

Question 2

1) What effect is had on muscle tone as a result of an UMN lesion?
2) What effect is had on muscle tone as a result of a LMN lesion?
3) What effect is had on muscle tone as a result of a NMJ lesion?
4) What effect is had on muscle tone as a result of a muscle lesion?

Answer 2

1) Increased
2) Reduced
3) Normal
4) Normal

Question 3

1) What effect is had on muscle power as a result of an UMN lesion?
2) What effect is had on muscle power as a result of a LMN lesion?
3) What effect is had on muscle power as a result of a NMJ lesion?
4) What effect is had on muscle power as a result of a muscle lesion?

Answer 3

1) Localised to the affected muscle groups
2) Localised to the afferent nerves
3) Fatigable weakness
4) Various patterns of weakness

Question 4

1) What effect is had on reflexes as a result of an UMN lesion?
2) What effect is had on reflexes as a result of a LMN lesion?
3) What effect is had on reflexes as a result of a NMJ lesion?
4) What effect is had on reflexes as a result of a muscle lesion?

Answer 4

1) Brisk
2) Absent
3) Usually normal
4) Usually normal

Question 5

Spasticity is associated with a lesion where?

Answer 5

UMN lesion

Question 6

Hypotonia is associated with a lesion where?

Answer 6

LMN lesion

Question 7

An exaggerated deep tendon reflex is associated with a lesion where?

Answer 7

UMN lesion