Clinical Manifestations of Cerebellar Lesions

Question 1

Dysmetria (Definition)

Answer 1

Impaired ability to scale movement distance

Question 2

Dysmetria (Clinical manifestation)

Answer 2

Hypermetric, hypometric mvmts; over and undershooting. Deficit in predicting limb dynamics

Question 3

Dyssynergia (Definition)

Answer 3

Limb segments do not have proper range or direction

Question 4

Dyssynergia (Clinical manifestation)

Answer 4

Impaired multijoint mvmts. Deficit in predicting limb dynamics

Question 5

Dysdiadochokinesia (Definition)

Answer 5

Deficit in coordination between agonist-antagonist mm. groups

Question 6

Dysdiadochokinesia (Clinical manifestation)

Answer 6

Slow, inconsistent mvmts during simple, fast, and alternating movements

Question 7

Decomposition (Definition)

Answer 7

Breaking down multijoint mvmts into series of separate mvmts

Question 8

Decomposition (Clinical manifestation)

Answer 8

Compensation for impaired coordination of multijoint mvmts (i.e. reaching: shoulder flexion, then elbow extension)

Question 9

Lack of check (Definition)

Answer 9

Inability to rapidly and sufficiently halt mvmt after resistance causing isometric force is released

Question 10

Lack of check (Clinical manifestation)

Answer 10

Excessive “rebound”

Question 11

Intention tremor

Answer 11

Form of action tremor that occurs during terminal portions of visually guided mvmts toward target

Question 12

Postural tremor

Answer 12

Occurs in muscles maintaining a static position against gravity (i.e. standing in place)