motor CNs

Question 1

UMN control of CN V is

Answer 1

bilateral

Question 2

UMN lesion of V

Answer 2

increased jaw jerk reflex

Question 3

LMN lesion of V

Answer 3

unilateral weakness, decreased jaw jerk

Question 4

UMN lesion of VII

Answer 4

unilateral, weak contralateral face muscle

forhead spared by other side’s UMN

Question 5

LMN lesion of VII

Answer 5

bells palsy

• ipsilateral face weakness (whole side)
• dry eye
• hyperacusis (cant dampen sound because xstapedus)

Question 6

LMN lesion of X

Answer 6

ipsilateral horseness
ipsilateral dysphagia
not symmetric palate elevation

Question 7

UMN lesion of X

Answer 7

few symptoms

-significant bilateral innervation

Question 8

Muscles innervated by XI

Answer 8

Contralateral trapezius

ipsilateral SCM

Question 9

LMN lesion of XI (left)

Answer 9

xL trap –> xElevate tip of left shoulder

xL SCM –> xRotate to right side

Question 10

UMN Lesion of XI (left)

Answer 10

xL SCM –> xRotate to right side

xR trap –> cant elevate right shoulder

Question 11

LMN of XII left

Answer 11

tongue points to left

-fasciculations and atrophy of left tongue

Question 12

UMN of XII left

Answer 12

tongue points to right

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