Cranial Nerve Flash Cards

Question 1

Name CN I-XII

Answer 1

olfactory CN I
optic CNII 
occulomoterCN III
trochlear CN IV
trigeminal CN V 
abducens CN VI
facial CN VII
vestibulococliear CN VIII
glossopharyngeal CN IX
vagus CN X
accessory CN XI
hypoglossal CNXII

Question 2

CN I (origin, exit, path, lesion locator, fiber/function)

Answer 2

Olfactory Nerve (sensory)
O: olfactory bulb
E: cribiform foramina
P: short subarachnoid course + penetrates arachnoid & dura to nasal cavity
LL: Inferior Aspect of Frontal Lobes (anosmia)
Fx: olfactory epithelium, Special Sensory-Smell

Question 3

CN II

Answer 3

Optic Nerve (sensory)
O: optic chiasm
E: optic canal
P: exit optic canal w/n subarachnoid space, carries dura, arachnoid, pia and subarachnoid space to posterior eyeball
LL: Ventral Diencephalon (visual field deficits)
Fx: retina, Special Sensory-vision

Question 4

CN III

Answer 4

Oculomotor Nerve (motor)
O: medial cerebral peduncles of midbrain
E: suprior orbital fissure
P: ant. tentorium to sup to post clinoid process then along carenous sinus
LL: Midbrain (eyes down + out, dilated pupils, ptosis, blurry vision)
Fx: PS to sphincter pupillae+ciliary muscles, Motor to levator palpebrae superioris, sup,med, inf recti, inf oblique muscles of eye (motor, pupil constriction)

Question 5

CN IV

Answer 5

Trochlear Nerve (motor)
O: midbrain
E: superior orbital fissure
P: long subarach course around midbrain, enters dura lat to post clinoid process to orbit
LL: Midbrain (can’t internal rotate eye or look down when adducted)
Fx: motor to superior oblique muscle

Question 7

CN V1

Answer 7

Opthalmic branch of Trigeminal Nerve
O: superior orbital fissure
E: supraorbital foramen

NFL- Nasociliary n, Frontal n, Lacrimal n

Question 8

CN V2

Answer 8

Maxillary branch of Trigeminal Nerve
O: Foramen rotundum
E: pterygopalatine fossa, pterygomaxillary fissure, infraorbital fissure

ZIP- Zygomatic n, Infraorbital n, Pterygopalatine ganglion

Question 9

CN V3

Answer 9

Mandiublar branch of Trigeminal Nerve
O: foramen ovale

BAIL- Buccal n, Auriculotemporal n, Inf alveolar n, Lingual n

Question 10

CN VI

Answer 10

Abducens Nerve (motor)
O: low pons
E: superior orbital fissure
P: longest intracranial and intradural course
LL:
Fx: motor- lateral rectus muscles (inwardly deviated eye, can’t abduct)

Question 11

Name Three Branches of CN V and Function

Answer 11

V1 Opthalmic, V2 Maxillary, V3 Mandibular

Question 12

CN VII

Answer 12

Facial Nerve

Question 13

CN VIII

Answer 13

Vestibulocochilear Nerve

Question 14

CN IX

Answer 14

Glossopharyngeal Nerve

Question 15

CN X

Answer 15

Vagus Nerve

Question 16

CN XI

Answer 16

Accessory Nerve

Question 17

CN XII

Answer 17

Hypoglossal Nerve