Cranial Nerves

Question 1

Palsy results in ptosis, ‘down and out’ eye, fixed, dilated pupil

Answer 1

CN III (occulomotor)

Question 2

Palsy results in defective downward gaze and vertical diploplia

Answer 2

CN IV (trochlear)

Question 3

Lesions may cause trigeminal neuralgia, loss of corneal reflex (afferent), loss of facial sensation, paralysis of mastication muscles, deviation of jaw to weak side

Answer 3

CNV (trigeminal)

Question 4

Palsy results in defective abduction (horizontal diplopia)

Answer 4

CN VI (abducens)

Question 5

Lesions may result in flaccid paralysis of upper and lower face, loss of corneal reflex (efferent), loss of taste, hyperacusis

Answer 5

CNVII (facial)

Question 6

Lesions may results in hypersensitive carotid sinus reflex, loss of gag reflex (afferent)

Answer 6

CN IX glossopharyngeal

Question 7

Lesions may result in uvula deviates away from site of lesion, loss of gag reflex (efferent)

Answer 7

CN X (vagus)

Question 8

Lesions may results in weakness turning head to contralateral side

Answer 8

CN XI (accessory)

Question 9

Tongue deviates to side of lesion

Answer 9

CNXII (hypoglossal)