Cranial Nerves

Question 1

Foramen for CN II

Answer 1

Optic Canal

Question 2

Foramen for CN I

Answer 2

Cribiform plate of ethmoid bone

Question 3

Foramen for CN III

Answer 3

Superior orbital fissure

Question 4

Brainstem/Ganglia for CN III

Answer 4

Midbrain/Ciliary

Question 5

Funcion of CN III

Answer 5

Superior, Medial, Inferior and inferior oblique msucles + levator palpebrae superioris of eyelid

Sphincter pupillae (accomodation)

Question 6

Foramen for CN IV

Answer 6

Superior Orbital fissure

Question 7

Brainstem/Ganglia for CN IV

Answer 7

Midbrain Dorsal Surface

N/A

Question 8

Function of CN IV

Answer 8

Superior oblique muscle

Question 9

Foramen for CN V

Answer 9

V1: Superior Oblique Fissure
V2: Foramen Rotundum to Infraorbital fissure
V3: Foramen ovale to mandibular foramen and mental foramen

Question 10

Function of CN V

Answer 10

Somatic sensory
V1: Opthalmic sensory - Forhead, eyelids, tear glands
V2: Maxillary sensory Face, upper lip, upper teeth and gums
V3: Lower teeth, gums, lip, skin of jaw, anterior 2/3 tongue

Somatic motor
Motor for mastication (temporalis, med/lat pterygoid, masseter). anterior digastrics, mylohyoid, tensor tympani, tensor veli palati

Question 11

Brainstem/Ganglion for CN V

Answer 11

Pons/Trigeminal

Question 12

Foramen for CN VI

Answer 12

Superior orbital fissure

Question 13

Brainstem/ganglion for CN VI

Answer 13

Pons

N/A

Question 14

Function of CN VI

Answer 14

Lateral rectus muscle (Abducts eye)

Question 15

Foramen for CN VII

Answer 15

Internal auditary meatus to stylomastoid foramen

Question 16

Function of CN VII

Answer 16

Motor
Muscles of facial expression

Autonomics
Parasympathetic to lacrimal & salivary glands

Sensory
Taste to anterior 2/3 of tongue (Chorda typani)
Skin of external ear

Question 17

Branches of CN VII

Answer 17

“Two zebras bit my cock”
Temporal
Zygomatic
Buccal
Mandibular
Cervical

Question 18

Foramen for CN VIII

Answer 18

Internal auditory canal

Question 19

Brainstem/ganglion for VIII

Answer 19

Pontomedullary junction

Vestibular ganglion and cochlear glanglion

Question 20

Brainstem/ganglion for CNVII

Answer 20

Pons/Geniculate

Question 21

Function of VIII

Answer 21

Cochlear - Auditory
Vestibular - balance

Question 22

Foramen for IX

Answer 22

Jugular foramen

Question 23

Brainstem/ganglion for IX

Answer 23

Medulla

Superior/inferior glossopharyngeal ganglia (sensory)
 Otic glanglion (parasympathetic to parotid)

Question 24

Function of IX

Answer 24

Sensory
Posterior 1/3 and middle ear
Taste: Posterior 1/3 of tongue

Paraysmpathetic
Carotid body/sinus (afferent)
Parotid gland (efferent)

Motor
Stylopharyngeus (swallowing)

Question 25

Foramen for X

Answer 25

Jugular

Question 26

Brainstem/Ganglia for X

Answer 26

Medulla

Superior/inferior vagal

Question 27

Function for CN X

Answer 27

Sensation
Skin from ear
Pharynx/larynx
Taste from epiglottis
Chemoreceptors from aortic arch
Viscera to splenic flexure of colon

Motor
Musucles of larynx/pharnx except stylopharyngeus

Parasympathetics
To all structures in chest and abdomen to left colic flexure

Question 28

Foramen for XI

Answer 28

Jugular

Question 29

Brainstem/ganglion for XI

Answer 29

Medulla

N/A

Question 30

Function of XI

Answer 30

Motor to trapezius and sternocleidomastoid

Question 31

Forament for CN XII

Answer 31

Hypoglossal

Question 32

Function for CN XII

Answer 32

All intrinsic/extrinsic tongue muscle (except palatoglossus)

Question 33

Brainstem/Foramen for XII

Answer 33

Medulla

None