Cranial Nerves

Question 1

Cranial nerve 1 and it’s function

Answer 1

Olfactory - smell

Question 2

Pathway of olfactory nerve ?

Answer 2

Cribriform plate

Question 3

Cranial nerve 2 and it’s function

Answer 3

II (Optic) - sight

Question 4

Pathway/foramen which optic nerve goes through

Answer 4

Optic canal

Question 5

What is the role of the third cranial nerve

Answer 5

III (Oculomotor) - Pupil constriction
Accomodation
Eyelid opening

Eye movement

Question 6

Clinical affects of cranial nerve 3 ?

Answer 6

dilated, fixed pupil
Ptosis

‘down and out’ eye

Question 7

Through which pathway do cranial 3 run?

Answer 7

Superior orbital fissure

Question 8

Function of cranial nerve 4

Answer 8

Trochlear nerve - superior oblique eye movement

Question 9

Clinical effects of trochlear nerve ?

Answer 9

Palsy results in defective downward gaze → vertical diplopia

Question 10

Pathway of trochlear nerve

Answer 10

Superior orbital fissure

Question 11

Function of the fourth cranial nerve

Answer 11

Trigeminal - Facial sensation
Mastication

Question 12

Clinical effects of trigeminal nerve

Answer 12

Lesions may cause:

trigeminal neuralgia

loss of corneal reflex (afferent)

loss of facial sensation

paralysis of mastication muscles

deviation of jaw to weak side

Question 13

Route of trigeminal nerve?

Answer 13

V1: SOF,
V2: Foramen rotundum,
V3: Foramen ovale

Question 14

Function of the 6th cranial nerve

Answer 14

Abducens - lateral rectus eye movement

Question 15

Clinical effect of abducens nerve

Answer 15

Palsy results in defective abduction → horizontal diplopia

Question 16

Pathway/route of cranial nerve 6?

Answer 16

SUPERIOR ORBITAL FISSURE

Question 17

Role of 7th to cranial nerve

Answer 17

Facial nerve
Facial movement
Taste (anterior 2/3rds of tongue)
Lacrimation
Salivation

Question 18

Clinical effects of 7th cranial nerve

Answer 18

flaccid paralysis of upper + lower face
loss of corneal reflex (efferent)
loss of taste
hyperacusis

Question 19

Pathway of 7 th cranial nerve

Answer 19

Internal auditory meatus

Question 20

Cranial nerve 8th role?

Answer 20

Vestibulocochlear)
Hearing, and balance(vertigo )

Question 21

Acoustic neuromas are Schwann cell tumours of the

Answer 21

Cochlea nerve

Question 22

Pathway of vestibular cochlear nerve ?

Answer 22

Internal auditory meatus

Question 23

Lesions in glossppharyngeal nerve may result in;

Answer 23

hypersensitive carotid sinus reflex
loss of gag reflex (afferent)

Question 24

The route or pathway that glossopharyngeal nerve goes through?

Answer 24

Jugular foramen

Question 25

Cranial nerve 10 role ?

Answer 25

X (Vagus) Phonation Swallowing Innervates viscera

Question 26

Lessons to cranial nerve 10 may result in;

Answer 26

uvula deviates away from site of lesion loss of gag reflex (efferent)

Question 27

Exit pathway of vagus nerve

Answer 27

Jugular foramen

Question 28

Role of cranial nerve 11

Answer 28

Accessory nerve - Head and shoulder movement

Question 29

Clinical features affects accessory nerve

Answer 29

Lesions may result in; weakness turning head to contralateral side

Question 30

Exit route if accessory nerve ?

Answer 30

Jugular foramen

Question 31

Role of 12th cranial nerve

Answer 31

XII (Hypoglossal) - Tongue movement

Question 32

Lesion of 12th cranial nerve gives?

Answer 32

Tongue deviates towards side of lesion

Question 33

Exit pathway of 12th cranial nerve

Answer 33

Hypoglossal canal